Rocket trail arcing over Los Angeles.

This image shows the trail of NASA’s Mars InSight lander over the Los Angeles area after launching from Vandenberg Air Force Base in Central California on May 5, 2018. This is a stack of exposures taken from Mt. Wilson. Credit: NASA/D. Ellison

May the fifth be with you. Mars InSight, the very first mission to study the deep interior of Mars, has launched. Below, 10 things to know as we head to the heart of the Red Planet.

1. What’s in a name? "Insight" is to see the inner nature of something, and InSight—a.k.a. Interior Exploration using Seismic Investigations, Geodesy and Heat Transport—will do just that. InSight will take the "vital signs" of Mars: its pulse (seismology), temperature (heat flow) and reflexes (radio science). It will be the first thorough check-up since the planet formed 4.5 billion years ago.

2. Marsquakes. You read that right: earthquakes, except on Mars. Scientists have seen a lot of evidence suggesting Mars has quakes, and InSight will try to detect marsquakes for the first time. By studying how seismic waves pass through the different layers of the planet (the crust, mantle and core), scientists can deduce the depths of these layers and what they're made of. In this way, seismology is like taking an X-ray of the interior of Mars.

Want to know more? Check out this one-minute video.

3. More than Mars. InSight is a Mars mission, but it’s also so much more than that. By studying the deep interior of Mars, we hope to learn how other rocky planets form. Earth and Mars were molded from the same primordial stuff more than 4.5 billion years ago, but then became quite different. Why didn’t they share the same fate? When it comes to rocky planets, we’ve only studied one in great detail: Earth. By comparing Earth's interior to that of Mars, InSight's team hopes to better understand our solar system. What they learn might even aid the search for Earth-like exoplanets, narrowing down which ones might be able to support life.

Insight instruments labeled
The InSight Lander’s three primary instruments, SEIS, HP3, and RISE, take the first-ever in-depth look at the planet's “inner space.” This trio will study the fingerprints of the process of planet formation, buried deep in the Martian interior. Credit: NASA/JPL-Caltech

4. Robot testing. InSight looks a bit like an oversized crane game: When it lands on Mars this November, its robotic arm will be used to grasp and move objects on another planet for the first time. And like any crane game, practice makes it easier to capture the prize.

Want to see what a Mars robot test lab is like? Take a 360 tour.

5. The gang’s all here. InSight will be traveling with a number of instruments, from cameras and antennas to the heat flow probe. Get up close and personal with each one in our instrument profiles.

6. Trifecta. InSight has three major parts that make up the spacecraft: Cruise Stage; Entry, Descent, and Landing System; and the Lander. Find out what each one does here.

7. Solar wings. Mars has weak sunlight because of its long distance from the Sun and a dusty, thin atmosphere. So InSight’s fan-like solar panels were specially designed to power InSight in this environment for at least one Martian year, or two Earth years.

8. Clues in the crust. NASA scientists have found evidence that Mars’ crust is not as dense as previously thought, a clue that could help researchers better understand the Red Planet’s interior structure and evolution. “The crust is the end-result of everything that happened during a planet’s history, so a lower density could have important implications about Mars’ formation and evolution,” said Sander Goossens of NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

9. Passengers. InSight won’t be flying solo—it will have two microchips on board inscribed with more than 2.4 million names submitted by the public. "It's a fun way for the public to feel personally invested in the mission," said Bruce Banerdt of JPL, the mission's principal investigator. "We're happy to have them along for the ride."

10. Tiny CubeSats, huge firsts. The rocket that will loft InSight beyond Earth will also launch a separate NASA technology experiment: two mini-spacecraft called Mars Cube One, or MarCO. These suitcase-sized CubeSats will fly on their own path to Mars behind InSight. Their goal is to test new miniaturized deep space communication equipment and, if the MarCOs make it to Mars, may relay back InSight data as it enters the Martian atmosphere and lands. This will be a first test of miniaturized CubeSat technology at another planet, which researchers hope can offer new capabilities to future missions.