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2. In Depth | Phobos – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/mars-moons/phobos/in-depth.amp

   Phobos, gouged and nearly shattered by a giant impact crater and beaten by thousands of meteorite impacts, is on a collision course with Mars. Phobos is the larger of Mars' two moons and is 17 x 14 x 11 miles (27 by 22 by 18 kilometers) in diameter.

3. In Depth | Mars – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/mars/in-depth.amp

   Moons Mars has two small moons, Phobos and Deimos , that may be captured asteroids. They're potato-shaped because they have too little mass for gravity to make them spherical.

4. In Depth | Moons – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/in-depth.amp

   The two moons of Mars, Phobos and Deimos, are different. While both have nearly circular orbits and travel close to the plane of the planet's equator, they are lumpy and dark. Phobos is slowly drawing closer to Mars and could crash into the planet in 40 or 50 million years.

5. Overview | Mars – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/mars/overview.amp

   Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to roam the alien landscape. NASA currently has two rovers (Curiosity and Perseverance), one lander , and one helicopter exploring the surface of Mars.

6. In Depth | Earth's Moon – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/earths-moon/in-depth.amp

   The leading theory of the Moon's origin is that a Mars-sized body collided with Earth about 4.5 billion years ago. The resulting debris from both Earth and the impactor accumulated to form our natural satellite 239,000 miles (384,000 kilometers) away.

7. Mars By the Numbers – NASA Solar System Exploration

   solarsystem.nasa.gov/mars-by-the-numbers

   The gravitational acceleration experienced at its surface at the equator. The speed needed for an object to break away from the gravitational pull of a planet or moon. The numbers displayed here are approximations. For more precise data, please visit JPL Solar System Dynamics.

8. In Depth | Our Solar System – NASA Solar System Exploration

   solarsystem.nasa.gov/solar-system/our-solar-system/in-depth.amp

   Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

9. Planet Compare – NASA Solar System Exploration

   solarsystem.nasa.gov/planet-compare

   Planet Compare. NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

10. In Depth | Venus – NASA Solar System Exploration

    solarsystem.nasa.gov/planets/venus/in-depth.amp

    The ancient Romans could easily see seven bright objects in the sky: the Sun, the Moon, and the five brightest planets (Mercury, Venus, Mars, Jupiter, and Saturn). They named the objects after their most important gods.

11. Lunar and Martian Lava Tube Exploration as Part of an Overall ...

    solarsystem.nasa.gov/studies/4/lunar-and-martian-lava-tube-exploration-as-part...

    This paper discusses the opportunity to search for and exploit lava tubes on the surfaces of the Moon and Mars as a means of enabling ambitious planetary science missions.