In Depth | Mars - NASA Solar System Exploration
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.
In Depth | Phobos - NASA Solar System Exploration
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 …
In Depth | Moons - NASA Solar System Exploration
Of the terrestrial (rocky) planets of the inner solar system, neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons. In the outer solar system, the …
Planet Compare - NASA Solar System Exploration
Jan 9, 2025 · Mars Click for more Venus Click for more Saturn Click for more Uranus Click for more Neptune Click for more Earth's Moon Stay Connected. Solar System. ... About Moons; …
Mars By the Numbers - NASA Solar System Exploration
Jan 9, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited entirely by robots.
Lunar and Martian Lava Tube Exploration as Part of an Overall ...
Jan 9, 2025 · 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. …
In Depth | Phobos-Grunt – NASA Solar System Exploration
Nov 8, 2011 · Russia's Phobos-Grunt mission would have studies Mars’ moon, Phobos, as well as return soil samples to Earth in order to determine the origin and evolution of this moon. In …
In Depth | Fobos 2 – NASA Solar System Exploration
Feb 21, 2019 · Goals: Fobos 1 and 2 were part of an ambitious Russian plan to explore Mars and its moon Phobos. Each spacecraft comprised an orbiter for long term studies of the planet and …
Lava Caves: California and the Moon - NASA Solar System …
Jun 9, 2021 · Naturally-occuring lava caves may someday shelter astronauts on the Moon and Mars from harmful radiation. (Images not to scale.)
In Depth | Fobos 1 – NASA Solar System Exploration
Feb 21, 2019 · Goals: Fobos 1 and 2 were part of an ambitious Russian plan to explore Mars and its moon Phobos. Each spacecraft comprised an orbiter for long term studies of the planet and …