Mars and Earth: The similarities
Everything we've learned about Mars over the last century suggests that the planet was once able of hosting ecosystems.
- Mars is just over half the size of Earth.
- Gravity is only 38 percent than that of Earth's.
- It rotates around its axis at about the same speed as Earth, meaning that a day on Mars is just 40 minutes longer than on Earth.
- One year on Mars takes about 687 Earth days.
- Mars has the same amount of habitable surface as Earth. It also contains ice on the polar caps.
But Mars is wrapped in a thin carbon dioxide atmosphere and cannot support earthly life forms.
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