Education News & Blogs – NASA Jet Propulsion Laboratory

Get the inside scoop on the Europa Clipper mission and its journey to explore an icy moon of Jupiter that could have conditions suitable for life. Plus, find ways to bring the excitement of the mission to your students.

In October, NASA's Europa Clipper mission will launch on a journey to investigate one of the next frontiers in our search for life beyond Earth. Its destination: Jupiter's moon Europa. Beneath its icy crust, the small moon is thought to contain a saltwater ocean with more water than all of Earth’s oceans combined. By studying the moon up close with a suite of scientific instruments, Europa Clipper aims to improve our understanding of the conditions on Europa and explore whether the moon could be suitable for life.

Read on to learn why scientists are so interested in this tiny ocean world and get to know the science behind the Europa Clipper mission. Then, follow along with the mission in the classroom using STEM teaching and learning resources.

Why Explore Europa?

In recent years, scientists have discovered likely water worlds throughout our solar system that might harbor conditions suitable for life. But scientists are especially intrigued by Jupiter's moon Europa because it hosts several components that make it one of the most promising for harboring a habitable environment.

Slightly smaller in size than Earth's Moon, Europa is one of Jupiter’s 95 officially recognized moons. Europa was discovered along with Jupiter's three other largest moons more than 400 years ago by astronomer Galileo Galilei, and named by astronomer Simon Marius, who discovered Europa around the same time.

An illustration shows the rough jagged surface of Europa. On the horizon is Jupiter rising with the Sun in the distant background.

This artist's concept shows a simulated view from the surface of Jupiter's moon Europa. Credit: NASA/JPL-Caltech | + Expand image

Scientific observations of Europa by previous spacecraft, including the Galileo mission to Jupiter, point to the existence of a subsurface salty ocean. These observations included spectroscopic measurements indicating the surface is mostly water ice; gravitational and moment-of-inertia measurements indicating a layered internal structure, including a water and ice layer near the surface that is 62 miles (100 kilometers) thick; and magnetic field measurements indicating a conductive layer near the surface. A salty ocean would explain these observations.

Though Europa has been studied by the Galileo spacecraft and the more recent Juno spacecraft with a few up-close flybys, Europa Clipper will allow us to build on previous findings to gain new perspectives on the moon with a Europa-dedicated mission.

Half of Europa is illuminated against the black background of space. The light blue icy surface is covered with reddish lines irratically crossing the moon.

The surface of Jupiter's icy moon Europa is visible in this view made from images taken by NASA's Galileo spacecraft in the late 1990s. Image credit: NASA/JPL-Caltech | + Expand image

Europa’s surface is crisscrossed by long, linear fractures, cracks, ridges, and bands. This ice shell is probably 10 to 15 miles (15 to 25 kilometers) thick. Evidence suggests that below Europa’s icy surface there is a saltwater ocean that is about 25 times deeper than Earth's oceans and contains about twice as much water. Scientists are hopeful that the Europa Clipper mission will refine these estimates.

In addition to water, Europa could have other conditions needed for life as we know it, including chemistry, energy, and stability. NASA scientists believe that six essential chemical building blocks for life exist on Europa and have likely existed there since Europa formed. These common elements are carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur.

Chemical energy, similar to that produced by hydrothermal vents found on Earth’s ocean floor, may also exist on Europa’s sea floor. As Europa orbits Jupiter, it gets stretched and released by the tug of gravity from the giant planet. This process, called tidal flexing, creates heat, much in the same way a paperclip that is repeatedly bent back and forth can get hot to the touch. This tidal flexing process could keep the ocean liquid and may also be creating heat that could be released through hydrothermal vents on the ocean floor. On Earth, hydrothermal vents spew forth heated water, minerals, and various chemicals that react with the salty ocean, releasing stored chemical energy.

Where did life originate on Earth? Could the process hold clues for finding life elsewhere? Credit: NASA/JPL-Caltech | Watch on YouTube

Radiation surrounding Jupiter is another possible source of fuel for life in an ocean below Europa's surface. Jupiter’s strong radiation bombards Europa, which is bad news for anything attempting to live on the surface. But the radiation splits apart water molecules at the surface. Once the water molecules are split, the hydrogen floats away into space and the oxygen stays behind, making it available to bind to other elements. If the oxygen makes its way to the ocean through cracks or openings, it could react with other chemicals to provide chemical energy for microbial life.

A side by side comparison shows Earth's and Europa's water content as glasses of water. Earth's water fills up about one-third of a glass with a volume of 1.4 billion cubic kilometers, while Europa's glass is nearly full with a volume of three billion cubic kilometers. Additonal text states Earth's surface is 29 percent land and 71 percent water while Europa's surface is covered in a global water ice crust ranging from 3-30 kilometers thick.

Compare the oceans of Earth and Europa. Image credit: NASA/JPL-Caltech | + Click for full image and description

In addition to these potentially life-supporting conditions, observations indicate that the environment on Europa has likely remained constant for four billion years. Environmental stability is important to allow time for life to form and evolve. Such a promising stable environment is ripe for further exploration.

Europa Clipper Science

The Europa Clipper spacecraft will be the largest in NASA’s planetary mission history, measuring 16 feet (five meters) in height. Its giant solar arrays, the largest space-faring solar arrays to date, unfold in space to span the length of a basketball court, more than 100 feet (30.5 meters), and cover 950 square feet (90 square meters). Such an enormous light-collecting area is required because the intensity of the Sun near Jupiter is only 3% of what it is on Earth, and the massive arrays need to capture enough sunlight to power Clipper’s science instruments.

Europa Clipper has a powerful suite of nine science instruments designed to work together to study Europa’s surface features, improve our understanding of the moon’s icy shell, examine the interaction between the ocean and the icy shell, and investigate the ocean’s composition to determine if it has the ingredients to sustain life.

Exploring Europa’s Icy Surface

The spacecraft will collect images and generate surface maps using its onboard cameras and spectrometers which can identify chemical signatures from reflected light. The Europa Imaging System contains wide-angle and narrow-angle cameras, which will produce high-resolution color and stereoscopic images of Europa. These cameras will study Europa's geologic activity and measure surface elevations. The Europa Thermal Emission Imaging System will use infrared light to measure surface texture and characterize warmer regions where the liquid ocean may be closer to the surface. It will also show any visible evidence of water eruptions. The Europa Ultraviolet Spectrograph will use a telescope to collect ultraviolet light to help determine the makeup of Europa's sparse atmospheric gases and surface materials. It will also search for signs of plumes erupting from the surface.

A mass spectrometer and dust analyzer will measure the composition of tiny particles in Europa’s extremely thin atmosphere and surrounding environment. The mass spectrometer, or MASPEX, will analyze gases in Europa’s sparse atmosphere and in any plumes, as well as the chemical makeup of the ocean. The Surface Dust Analyzer will identify the chemistry of solid material ejected from Europa to offer clues about the surface composition and ocean salinity.

Examining Europa’s Icy Shell and Sub-surface Ocean

The spacecraft will search for water under Europa’s surface using radar and will gather magnetic field measurements with a magnetometer. An ice-penetrating radar instrument called REASON will examine the ice structure and thickness. It works by transmitting radio waves that bounce off of features within the ice, like cracks or pockets of water. By measuring the time difference between transmission and return, REASON will learn how far the features are from the spacecraft, and therefore, how deep they are in the ice. This highly specialized and advanced radar can also measure differences in the composition of materials on Europa. It does this by measuring the energy difference between transmitted and returning signals and combining them with distance measurements.

A side by side comparison shows an illustrated cutaway of Europa. The left side shows a thin ice crust and deep ocean underneath while the right side shows a thick ice crust and shallower ocean below.

This artist's concept illustrates two possible cut-away views through Europa's ice shell. In both, heat escapes, possibly volcanically, from Europa's rocky mantle and is carried upward by buoyant oceanic currents. Image credit: NASA/JPL-Caltech/Michael Carroll | + Expand image

The Europa Clipper Magnetometer works by measuring small changes in Europa’s magnetic signal and how they vary with time and location. Measuring Europa’s magnetic signal could confirm the existence of an ocean and will help determine the ocean’s depth and salinity as well as the thickness of the moon's icy shell.

These instruments work in conjunction with several other instruments to closely study Europa during the flybys and return data for scientists to analyze for years to come. Explore a full list of instruments and learn how they work on the Europa Clipper mission website.

Getting to Europa

To save fuel for its journey to Europa, the spacecraft will follow what’s known as a Mars-Earth Gravity Assist trajectory for its 5.5-year journey. This path will first take the spacecraft near Mars to get a gravity assist – a boost in momentum obtained by tugging on Mars, thereby slightly decreasing Mars’ orbital momentum while transferring that momentum to the spacecraft. Next, Europa Clipper will swing back by Earth for another gravity assist before continuing on to Jupiter for its scheduled arrival in April 2030.

Earth, Mars and Jupiter orbits are shown in red. A blue line traces the trajectory of the Europa Clipper spacecraft from Earth, to Mars for a gravity assist, back to Earth for a gravity assist and then on to Jupiter.

This graphic shows the Mars-Earth gravity assist trajectory the Europa Clipper spacecraft will follow to reach Jupiter. Credit: NASA/JPL-Caltech | + Expand image

Once it arrives, Europa Clipper will orbit Jupiter in an elongated ellipse that will bring the spacecraft close to Europa about 50 times. The orbit was designed in this way to decrease the impact of Jupiter’s radiation on the spacecraft, which can damage its electronics. Studies show that a spacecraft orbiting Europa may survive for a few months, while one orbiting Jupiter would last for many years. After each close flyby of Europa, the spacecraft will travel outside Jupiter’s radiation belts to downlink data to Earth, uplink new commands, and prepare for the next flyby.

Jupiter is shown as a dot in the center of the image. Four yellow concentric circles represent the orbits of Jupiter's four largest moons. Dozens of blue elipses orbit Jupiter to show the path the Europa Clipper spacecraft will take as it studies Europa.

Known as a petal plot for the way it resembles petals of a flower, this diagram displays the orbital path around Jupiter the Europa Clipper spacecraft will take as it explores Europa. Credit: NASA/JPL-Caltech | + Expand image

Follow Along

The Europa Clipper spacecraft is scheduled to launch in October 2024 from Kennedy Space Center in Florida. Tune in to watch the launch on NASA TV.

Visit the Europa Clipper mission website for all the latest mission updates, images, and science.

Teach Europa Clipper Science and Engineering

The Europa Clipper mission is a great opportunity to engage students with hands-on learning opportunities that range from imagining alien life forms to finding Jupiter in the night sky to engaging in the same science that led scientists to suspect the existence of Europa’s salty ocean. Explore these lessons and resources to get students excited about the STEM involved in this mission to determine if life-supporting conditions exist on Europa.

For Educators

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Europa Clipper Lessons

Explore this collection of standards-aligned STEM lessons connecting the Europa Clipper mission to classroom instruction.

For Students

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Europa Clipper Activities

Dive into this collection of DIY student projects, videos, and slideshows to learn more about Jupiter's moon Europa.

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ABOUT THE AUTHOR

Anne Tapp Jaksa, Professor of Teacher Education, Saginaw Valley State University

Anne Tapp Jaksa is a professor of teacher education at Saginaw Valley State University. In 2023, she served as an educator in residence with the K-12 Education team at NASA's Jet Propulsion Laboratory. Outside of writing and teaching, she enjoys serving as a volunteer for educational organizations, traveling, and gazing at the stars.

Get to know GUSTO and learn how to bring the science and engineering behind this unique balloon-based mission into the classroom.

A NASA balloon mission designed to study the interstellar medium – the space between stars – will take to the skies above Antarctica in December 2023.

Read on to learn how the GUSTO mission's unique design and science goals can serve as real-life examples of STEM concepts. Then, explore lessons and resources you can use to get students learning more.

What the GUSTO Mission Will Do

Though many people think of space as empty except for things like stars, planets, moons, asteroids, meteors, and comets, it’s anything but. Typically, there is one molecule of matter in every cubic centimeter of the space between stars known as the interstellar medium. In more dense clouds of interstellar gas, there could be as many as 1,000,000 molecules per cubic centimeter. It might not seem like much compared with the 10,000,000,000,000,000,000 molecules in every cubic centimeter of air we breathe, but the interstellar medium can tell us a lot about how stars and planets form and what role gases and dust play in our galaxy and others.

Star-forming nebulas birth Sun-like stars, which turn into red giants, then planetary nebulae, then white dwarfs. Massive stars are also born from star-forming nebulas and become red supergiants, then supernova, then either black holes or neutron stars.

This diagram shows the life cycles of Sun-like and massive stars. Credit: NASA, Night Sky Network | › Learn more about star life cycles

Like plants and animals, stars have a life cycle that scientists want to better understand. Gases and dust grains that make up a dense interstellar cloud, known as a nebula, can become disturbed, and under the pull of their own gravity, begin collapsing in on themselves. Eventually stars form from the gas and planets form from the dust. As a star goes through its life, it eventually runs out of sources of energy. When this happens, the star dies, expelling gases – sometimes violently, as in a supernova – into a new gas cloud. From here, the cycle can start again. Scientists want to know more about the many factors at play in this cycle. This is where GUSTO comes in.

GUSTO – short for Galactic/Extragalactic ULDB Spectroscopic Terahertz Observatory – is a balloon-based telescope that will study the interstellar medium, the small amount of gas and dust between the stars. From its vantage point high above almost all of the Earth’s atmosphere, GUSTO will measure carbon, nitrogen, and oxygen emissions in the far-infrared portion of the electromagnetic spectrum, focusing its sights on the Milky Way galaxy and the nearby galaxy known as the Large Magellanic Cloud.

A speckled field of bluish stars is intersected by a diagonal strip of purple and brown clouds covering a glowing yellow band beyond.

Our galaxy, the Milky Way, has hundreds of billions of stars and enough gas and dust to make billions more stars. Credit: NASA | › Full image and caption

The mission is designed to provide scientists with data that will help them understand the complete lifecycle of the gas and dust that forms planets and stars. To achieve its goals, GUSTO will study:

The composition and formation of molecular clouds in these regions.
The formation, birth, and evolution of stars from molecular clouds.
The formation of gas clouds following the deaths of stars. And the re-start of this cycle.

Thick clouds of purple and pastel pink cover a speckled field of stars with clusters of large and especially bright blue and yellow stars glowing through the clouds.

Nearly 200,000 light-years from Earth, the Large Magellanic Cloud is a satellite galaxy of the Milky Way. Vast clouds of gas within it slowly collapse to form new stars. In turn, these light up the gas clouds in a riot of colors, visible in this image from the Hubble Space Telescope. Credit: NASA | › Full image and caption

Scientists hope to use the information collected by GUSTO to develop models of the Milky Way and Large Magellanic Cloud. Studying these two galaxies allows scientists to observe more details and make more accurate models. Those models can then be used for comparing and studying more distant galaxies that are harder to observe.

Why Fly on a Balloon?

Unlike most NASA missions, GUSTO won’t launch on a rocket. It will be carried to approximately 120,000 feet (36.5 kilometers) above Antarctica using what’s known as a Long Duration Balloon, or LDB.

Balloon missions provide a number of advantages to scientists conducting research. They are more affordable than missions that go to space and require less time to develop. They also offer a way to test new scientific instruments and technologies before they are used in space. For these reasons, balloons have become a popular way for university students to gain experience building and testing science instruments.

Explore how balloons are being used for Earth and space science in this video from the Johns Hopkins Applied Physics Laboratory, which is providing the mission operations for GUSTO and the balloon gondola where the mission's instruments will be mounted. | Watch on YouTube

GUSTO's use of the Long Duration Balloon provided by NASA’s Balloon Science Program offers several advantages over other types of scientific balloons. Conventional scientific balloons stay aloft for a few hours or a few days and rely on the balloon maintaining a line-of-sight to send and receive data. Long Duration Balloons use satellites for sending data and receiving commands and can stay afloat for a few weeks to a couple of months.

Made with a thin, strong, plastic film called polyethylene, LDBs are partially inflated with helium. As the balloon rises, the surrounding air pressure decreases, allowing the gas inside the balloon to expand, increasing the volume and pressure of the balloon. When fully expanded, the balloon has a volume of around 40 million cubic feet (1.1 million cubic meters). That’s big enough to fit an entire football stadium inside.

An A-frame support structure with two sets of wing-like solar panels extending from its sides floats above Earth holding a telescope at its center.

GUSTO will be attached to a balloon gondola like the one depicted in this artist's rendering. | + Expand image

The telescope itself will be attached to a platform known as a gondola, which is home to several components that make the mission possible. The multi-axis control system will keep the platform stable during flight, allowing for precisely pointing GUSTO’s 35-inch (90-centimeter) diameter telescope in the right direction. Cryocoolers and liquid helium will keep the telescope’s scientific instruments at the necessary low temperature of -452°F (4° Kelvin). And the gondola will house a radio system that allows operators on the surface to control the balloon and telescope. All these systems will be powered by lithium-ion batteries charged during flight by a set of solar arrays.

Location is Everything

GUSTO is designed to measure terahertz wavelengths (in the far-infrared portion of the electromagnetic spectrum), a range of energy that is easily absorbed by water vapor. However, the observatory's altitude will put it in the upper half of the stratosphere and above 99% of the water vapor in the atmosphere. This makes it an ideal location for the mission to make its measurements and avoid factors that might otherwise obstruct its view.

GUSTO will make its observations from the upper half of the stratosphere, which offers several benefits over observing from lower in the atmosphere or from the ground. Credit: NASA | › Explore the interactive graphic

The stratosphere offers another advantage for GUSTO. This layer of the atmosphere warms as altitude increases, making the top of the stratosphere warmer than the bottom. The colder air at the bottom and warmer air at the top prevents mixing and air turbulence, making the air very stable and providing a great place to observe space. You may have noticed this stability if you’ve seen a flat-topped anvil-shaped storm cloud. That flat top is the cloud reaching the bottom of the stratosphere, where the stable air prevents the cloud from mixing upward.

But why fly GUSTO above Antarctica? Even though balloons can be launched from all over the planet, the 24 hours of sunlight per day provided by the Antarctic summer make the south polar region an ideal launch location for a solar-powered mission like GUSTO. But more important is a weather phenomenon known as an anticyclone. This weather system is an upper-atmosphere counter-clockwise wind flow that circles the South Pole about every two weeks. The Antarctic anticyclone allows for long balloon flights of missions that can be recovered and potentially reflown.

Preparing for Liftoff

To launch a balloon mission in Antarctica, weather conditions have to be just right. The anticyclone typically forms in mid-December but can arrive a little earlier or a little later. Even with the anticyclone started, winds on the ground and in the first few hundred feet of the atmosphere need to be under six knots (seven miles per hour) for GUSTO to launch. A NASA meteorologist provides daily updates on the cyclone and the ground.

Once weather conditions are good and the balloon is launched, it will circle Antarctica about once every 14 days with the wind. The anticyclone typically lasts one to two months. Because GUSTO may be in the air for more than two months, it’s possible that the mission will continue after the anticyclone ends, causing the balloon to drift northward as winter progresses.

Bring GUSTO Into the Classroom

The GUSTO mission is a great opportunity to engage students with hands-on learning opportunities. Students can build a planetary exploration balloon and model how interstellar dust forms into planets. Explore these lessons and resources to get students excited about the STEM involved in the mission.

Resources for Educators

Resources for Students

NASA's Universe of Learning materials are based upon work supported by NASA under award number NNX16AC65A to the Space Telescope Science Institute, working in partnership with Caltech/IPAC, Center for Astrophysics | Harvard & Smithsonian, and the Jet Propulsion Laboratory.

TAGS: GUSTO, Astronomy, Astrophysics, Science, Teaching, Learning, K-12, Classroom, Teachable Moments, Universe of Learning, Balloon Mission, Missions

ABOUT THE AUTHOR

Lyle Tavernier, Educational Technology Specialist, NASA-JPL Education Office

Lyle Tavernier is an educational technology specialist at NASA's Jet Propulsion Laboratory. When he’s not busy working in the areas of distance learning and instructional technology, you might find him running with his dog, cooking or planning his next trip.

As NASA retires its InSight Mars lander, here's a look at some of the biggest discoveries from the first mission designed to study the Red Planet's interior – plus, how to make connections to what students are learning now.

After more than four years listening to the “heartbeat” of Mars, NASA is saying goodbye to the InSight lander as the mission on the Red Planet comes to an end. On Dec. 21, 2022 scientists wrapped up the first-of-its-kind mission to study the interior of Mars as dust in the Martian atmosphere and on the spacecraft’s solar panels prevented the lander from generating enough power to continue.

Read on to learn how the mission worked, what it discovered, and how to bring the science and engineering of the mission into the classroom.

How It Worked

The lander is showin on the surface of Mars with a cutaway view of the Martian interior and core below the spacecraft. SEIS and HP3 are resting on the surface in front of the spacecraft and attached to InSight with long leash-like teathers. RISE juts out like a speaker from the flat top of the spacecraft between its two wing-like solar panels.

The locations of InSight's three main science tools, SEIS, HP3, and RISE are labeled in this illustration of the lander on Mars. | + Expand image | › Full image and caption

The InSight lander was designed to reveal the processes that led to the formation of Mars – as well as Earth, the Moon, and all rocky worlds. This meant meeting two main science goals.

First, scientists wanted to understand how Mars formed and evolved. To do that, they needed to investigate the size and make-up of Mars’ core, the thickness and structure of its crust, the structure of the mantle layer, the warmth of the planet's interior, and the amount of heat flowing through the planet.

Second, to study tectonic activity on Mars, scientists needed to determine the power, frequency, and location of “marsquakes” as well as measure how often meteoroids impacted the Red Planet, creating seismic waves.

Engineers equipped InSight with three main science tools that would allow researchers to answer these questions about Mars.

SEIS, a seismometer like the ones used on Earth to record earthquakes, measured the seismic waves on Mars. These waves, which travel through the Red Planet, can tell scientists a lot about the areas they pass through. They even carry clues about whether it was a marsquake or meteorite impact that created the waves.

InSight captured these images of clouds drifting in the distance, visible just beyond the dome-like top of the SEIS instrument. Credit: NASA/JPL-Caltech | + Expand image | › Full image and caption

InSight's Heat Flow and Physical Properties Package, or HP3, was an instrument designed to burrow 16 feet (five meters) into Mars to measure the temperature at different depths and monitor how heat flowed out toward the surface. However, the self-hammering probe, informally called the "mole," struggled to dig itself in due to the unexpected consistency of the top few inches of Mars regolith at the landing site. Using full-size models of the lander and probe, engineers recreated InSight’s environment here on Earth to see if they could find a solution to the issue. They tested solutions that would allow the probe to penetrate the surface, including pressing the scoop attached to InSight’s robotic arm against the probe. While the effort serves as a great real-world example of how engineers work through problems with distant spacecraft, ultimately, none of the solutions allowed the probe to dig past the surface when attempted on Mars.

In 2019, InSight mission scientist/engineer Troy Hudson shared the game plan for getting the mission's heat probe digging again on Mars. Ultimately, the team wasn't able to to get the "mole" working, but the effort is a great real-world example of how engineers work through problems with distant spacecraft. | Watch on YouTube

InSight’s third experiment, called RISE, used the spacecraft’s radio antennas to precisely measure the lander's position on the surface of Mars. The interior structure of Mars affects the planet’s motion, causing it to wobble. Measuring InSight’s position as the planet wobbled helped scientists gain a better understanding of the core and other layered structures that exist within the interior of Mars.

What We Discovered

A cutaway view of the interior of Mars shows a crust that is 0-25 mi (0-40 km) deep, an upper mantle that is 25-630 mi (40-1,015 km) deep; a transition zone that is 630-970 mi (1,015-1,560 km) deep, and a Core that is 970-2,105 mi (1,560-3,390 km) deep. Meteor impacts are shown as the sources of seismic activity. A separate inset shows InSight on the surface of a cutaway view of Mars' interior with lines representing Direct P, S waves extending from the upper mantle, through the curst, to SEIS on the surface.

Using its seismometer, InSight gained a deeper understanding of the interior layers of Mars, as detailed in this graphic. Image credit: NASA/JPL-Caltech | + Expand image | › Full image and caption

InSight’s instruments enabled the mission science team to gain an understanding of not only the depth of Mars’ crust, mantle, and core, but also the composition of those features. They also learned just how active Mars really is.

The Structure of Mars

Working our way from the surface to the center of the planet, scientists found Mars’ crust was thinner than expected. Seismic waves detected by SEIS indicate that the crust is made up of three sub-layers, similar to Earth’s crust. The top-most layer of the crust is about six miles (10 kilometers) deep, while the denser layers of the crust, which contain more felsic, or iron-rich, material extend downward to about 25 miles (40 kilometers) below the surface. As seismic waves from a marsquake or a meteorite impact spread across the surface and through the interior of the planet, they can reflect off of underground layers, giving scientists views into the unseen materials below. Measuring how the waves change as a result of these reflections is how scientists unveiled the underground structure of Mars.

Like Earth, Mars has a lithosphere, a rigid layer made up of the crust and upper mantle. The Martian lithosphere extends about 310 miles (500 kilometers) below the surface before it transitions into the remaining mantle layer, which is relatively cool compared with Earth’s mantle. Mars’ mantle extends to 969 miles (1,560 kilometers) below the surface where it meets the planet’s core.

The InSight lander is shown on the surface of Mars, where circular lines radiate out from a central point. The interior of Mars is shown with lines flowing left and right from the same central point and extending from the crust into Mars’ mantle down to its large central core. In the background, a cutaway shows the interior of Earth with more interior layers and a smaller core. Full problem text is available on the lesson page.

In this lesson from the "Pi in the Sky" math challenge, students use measurements from InSight along with pi to calculate the density of Mars' core. Image credit: NASA/JPL-Caltech | + Expand image | › Go to the lesson

Scientists measured the core of Mars and found it to be larger than expected, with a radius of 1,137 miles (1,830 kilometers). With this information, scientists were able to estimate the density of Mars' core, which turned out to be less dense than anticipated, meaning it contains lighter elements mixed in with iron. Scientists also confirmed that the planet contains a liquid core. While we know that Earth has a liquid outer core and solid inner core, scientists will need to further study the data returned from InSight to know if there is also a solid inner core on Mars.

As scientists continue to study the data returned from InSight, we could learn even more about how Mars formed, how its magnetic field developed, and what materials make up the core, which could ultimately help us better understand how Earth and other planets formed.

Marsquakes

InSight discovered that Mars is a very active planet. A total of 1,319 marsquakes were detected after the SEIS instrument was placed on the surface. The largest, which was estimated to be a magnitude 5, was detected in May of 2022.

Unlike Earth, where the crust is broken into large pieces called plates that continually shift around causing earthquakes, Mars’ crust is made up of one solid plate, somewhat like a shell. However, as the planet cools, the crust shrinks, creating breaks called faults. This breaking action is what causes marsquakes, and the seismic waves generated by the quakes are what help scientists figure out when and where the quakes occurred and how powerful they were.

A target symbol representing a marsquake appears on the other side of Mars from InSight. Pink and blue lines representing different waves extend around Mars from the left and right, respectively, of the epicenter. A green line extends from SEIS all the way around Mars and back to the instrument. An inset appears on top of SEIS that shows a recording of the wave measurements.

In this math problem from the "Pi in the Sky" series, students use pi to identify the timing and location of a hypothetical marsquake recorded by InSight. Image credit: NASA/JPL-Caltech | + Expand image | › Go to the lesson

Nearly all of the strongest marsquakes detected by InSight came from a region known as Cerberus Fossae, a volcanic region that may have had lava flows within the past few million years. Volcanic activity, even without lava flowing on the surface, can be another way marsquakes occur. Images from orbiting spacecraft show boulders that have fallen from cliffs in this region, perhaps shaken loose by large marsquakes.

This seismogram shows the largest quake ever detected on another planet. Estimated at magnitude 5, this quake was discovered by InSight on May 4, 2022. Listen to a sonification of this seismogram. | + Expand image | › Full image and caption

Conversely, InSight didn't detect any quakes in the volcanic region known as Tharsis, the home of three of Mars’ largest volcanos that sit approximately one-third of the way around the planet from InSight. This doesn’t necessarily mean the area is not seismically active. Scientists think there may be quakes occurring, but the size of Mars’ liquid core creates what’s known as a shadow zone – an area into which seismic waves don’t pass – at InSight's location.

Meteorite Impacts

On Sept. 5, 2021, InSight detected the impacts of a meteoroid that entered the Martian atmosphere. The meteoroid exploded into at least three pieces that reached the surface and left behind craters. NASA’s Mars Reconnaissance Orbiter passed over the impact sites to capture images of the three new craters and confirm their locations.

A direct overhead view of a light-gray-colored cratered surface is interrupted by three black splotches of increasing size from left to right. At the center of each dark scar is a royal blue splotch. The surface around the blue center looks as if it's been sprayed with a dark material that extends farther on the right side of each crater than on the left.

This image, captured by the Mars Reconnaissance Orbiter, shows the craters (in blue) formed by a meteroid impact on Mars on Sept. 5, 2021. The impact was the first to be detected by InSight. Image credit: NASA/JPL-Caltech/University of Arizona | + Expand image | › Full image and caption

“After three years of waiting for an impact, those craters looked beautiful,” said Ingrid Daubar of Brown University, a Mars impacts specialist.

Mars’ thin atmosphere, which is less than 1% as dense as Earth’s, means meteoroids have a better chance of not disintegrating in the heat and pressure that builds up as they pass through the atmosphere to the planet’s surface. Despite this fact and Mars' proximity to the asteroid belt, the planet proved to be a challenging location to detect meteorite impacts because of "noise" in the data created by winds blowing on SEIS and seasonal changes in the atmosphere.

With the confirmation of the September 2021 impacts, scientists were able to identify a telltale seismic signature to these meteorite impacts. With this information in hand, they looked back through InSight's data and found three more impacts – one in 2020 and two in 2021. Scientists anticipate finding even more impacts in the existing data that might have been hidden by the noise in the data.

Three overhead images of a brown cratered surfaces with a bright blue-colored crater at the center. Surrounding the crater in each image is a splotch of different colored material sprayed out in all directions.

This collage shows three other meteoroid impacts on Mars that were detected by the seismometer on InSight and captured by the Mars Reconnaissance Orbiter. Image credit: Credit: NASA/JPL-Caltech/University of Arizona | + Expand image | › Full image and caption

Meteorite impacts are an invaluable piece of understanding the planet’s surface. On a planet like Earth, wind, rain, snow and ice wear down surface features in a process known as weathering. Plate tectonics and active volcanism refresh Earth’s surface regularly. Mars’ surface is older and doesn't go through those same processes, so a record of past geologic events like meteorite impacts is more apparent on the planet's surface. By counting impact craters visible on Mars today, scientists can update their models and better estimate the number of impacts that occurred in the early solar system. This gives them an improved approximation of the age of the planet’s surface.

Learn how InSight detected the first seismic waves from a meteoroid on Mars and how the lander captured the sound of the space rock striking the surface. | Watch on YouTube

Why It's Important

Before InSight touched down, all Mars missions – landers, rovers, orbiters and flyby spacecraft – studied the surface and atmosphere of the planet. InSight was the first mission to study the deep interior of Mars.

Even with the InSight mission drawing to a close, the science and engineering of the mission will continue to inform our understanding of the Red Planet and our solar system for years as researchers further examine the data returned to Earth. Keep up to date with the latest findings from InSight scientists and engineers on the mission website.

Teach It

Explore these lessons in geology, physics, math, coding and engineering to connect student learning to the InSight mission and the real-world STEM that happens at NASA.

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Exploring Mars Activities

Make a cardboard rover, design a Mars exploration video game, learn about Mars in a minute and explore more STEM activities for students.