Space & Astronomy

Searching for Life on Mars

Why scientists believe Mars may once have supported life and how robot rovers search for evidence today.

B29 min

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1Mars has fascinated scientists for generations because it may once have supported life.

2Long ago, rivers and lakes probably covered parts of the red planet's surface.

3Today the planet is cold, dry and battered by fierce dust storms.

4Robot rovers now explore the surface and send photographs back to Earth.

5These machines drill into rocks and test the soil for ancient chemistry.

6Scientists search especially hard for signs of liquid water beneath the frozen ground.

7Where there is water, there might once have been tiny living organisms.

8Some recent missions have detected strange gases in the thin Martian atmosphere.

9These gases could come from living microbes, or perhaps from simple chemical reactions.

10Future spacecraft will bring Martian rock samples back to laboratories on Earth.

11One day, human explorers may walk there and continue the search themselves.

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