Life
Methane pockets may narrow search for Mars life
Methane in the Martian atmosphere is concentrated in three areas, stoking the debate over whether the gas has a biological origin
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Space
Angry Sun could spell disaster on Earth
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Space
Were Mercury and Mars separated at birth?
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Space
Gallery: Twin rovers celebrate five years on Mars
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Space
What has been moving rocks on Mars?
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Space
Danger ahead as the Sun goes quiet
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Space
2008: The year in the solar system
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Earth
Ancient Earth was a barren waterworld
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Space
Mystery stone circles may point to water on Mars
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Space
Mars rovers reach fifth anniversary
NASA's Spirit and Opportunity have defied expectations and spent five years exploring the Red Planet
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Life
Long-sought carbonate minerals found on Mars
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Space
Tonight’s Moon is biggest in 15 years
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Life
Swirling waters boost chance of life on Europa
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Earth
Meteor impacts may have sparked life on Earth
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