Martian Facts
Average distance from Sun |
142 million miles (228 million km) |
Length of year |
687 Earth days |
Length of solar day |
24 hours, 39 minutes, 35 seconds |
Diameter at equator |
4,150 miles (6,670 km) |
Average surface temperature |
-10�F(-23�C) [-240�F (-150�C) at poles, 32�F(0�C) at equator].
|
Space Probes that have gone to Mars
1965 |
Mariner 4 (USA) |
First successful flyby. |
1971 |
Mariner 9 (USA) |
First probe to orbit Mars. Returned thousands of images of the surface. |
1976 |
Vikings 1 and 2 (USA) |
First successful landings, together with orbiters. Collected wide range of data and images. |
Known Satellites
Phobos
Deimos
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