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| 4th planet from the Sun, the seventh largest planet in the solar system | |
| Average distance from the Sun | 227,940,000 km / 1.52 AU |
| Diameter | 6,794 km |
| Mass | 6.4219e23 kg |
| Orbital period around the Sun | 1.88 Earth years (687 Earth days) |
| Number of moons | 2, Deimos and Phobos |
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| Known as the Red Planet, Mars has a very thin atmosphere containing mostly carbon dioxide, with nitrogen, argon, and trace amounts of oxygen and water vapor. There is evidence that liquid water flowed on the surface long ago. Now all the water left on the planet is frozen in the polar ice caps or beneath the surface. Mars has two very small moons which are very close to the surface of the planet. | |
Our Solar System
Our solar system is located on the edge of a spiral arm called Orion’s Arm, and is one-half to two-thirds of the way (28,000 light-years) from the center of our Milky Way galaxy.The Sun, Sol
The Inner Planets
Mercury
Venus
Earth
The Moon
Mars
The Asteroid Belt
Dwarf planet, Ceres
Asteroid, Ida
Asteroid, Vesta
Asteroid, Eros
The Outer Planets
Jupiter
Saturn
Uranus
Neptune
The Kuiper Belt
Dwarf planet, Pluto
Dwarf planet, Eris
The Oort Cloud
Dwarf planet, Sedna
Comet Halley
Comet Hale-Bopp
Glossary of Terms
