Astronomy: Pluto

3. Evidence suggests ancient Mars once had abundant liquid water on its surface a key focus for current missions.
4. A massive shield volcano on Mars the largest volcano and tallest planetary mountain in the Solar System.
11. The Greek god of war equivalent to the Roman god Mars from whom the planet gets its name.
12. IceCaps Regions at Mars's poles composed of both water ice and frozen carbon dioxide (dry ice).
13. A NASA rover that explored Mars from 2004 to 2018 finding compelling evidence of past water activity.
14. The hypothetical process of modifying a planet's atmosphere and surface to make it habitable for humans.
15. The common nickname for Mars derived from the iron oxides (rust) in its soil.
18. The geological study of Mars analogous to geology on Earth.
19. The first extraterrestrial helicopter deployed by the Perseverance rover proving powered flight on Mars.
20. Impact craters on Mars are often very well preserved due to the lack of extensive erosion.

1. A NASA rover launched in 2011 which explored Gale Crater and found evidence of ancient habitable environments.
2. A NASA rover launched in 2020 currently exploring Mars's Jezero Crater for signs of ancient life.
5. The fourth planet from the Sun known as the "Red Planet" due to its iron oxide-rich surface.
6. Primarily composed of carbon dioxide with trace amounts of other gases much thinner than Earth's.
7. A large ancient impact basin on Mars one of the largest in the Solar System.
8. An extensive canyon system on Mars one of the largest in the Solar System much larger than Earth's Grand Canyon.
9. The smaller and outermost of Mars's two moons also thought to be a captured asteroid.
10. A NASA rover that explored Mars from 2004 to 2010 studying diverse rocks and geological features.
16. Frequent and sometimes planet-encompassing atmospheric events on Mars driven by strong winds.
17. One of Mars's two small irregularly shaped moons believed to be a captured asteroid.