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Were Mercury and Mars separated at birth?

Space

Were Mercury and Mars separated at birth?

A simulation of how a rocky ring of debris formed the inner planets reveals why Mars and Mercury are much smaller than Earth and Venus

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Space

Angry Sun could spell disaster on Earth

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Gallery: Twin rovers celebrate five years on Mars

Space

Gallery: Twin rovers celebrate five years on Mars

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What has been moving rocks on Mars?

Space

What has been moving rocks on Mars?

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Danger ahead as the Sun goes quiet

Space

Danger ahead as the Sun goes quiet

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2008: The year in the solar system

Space

2008: The year in the solar system

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Ancient Earth was a barren waterworld

Earth

Ancient Earth was a barren waterworld

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Space

Mars rovers reach fifth anniversary

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Mystery stone circles may point to water on Mars

Space

Mystery stone circles may point to water on Mars

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Long-sought carbonate minerals found on Mars

Life

Long-sought carbonate minerals found on Mars

Carbonate minerals, which form in the presence of water, have only been found in trace amounts on Mars – until now

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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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Space

'Rhythms' in Martian rocks mark out past climate swings

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