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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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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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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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Ancient Earth was a barren waterworld

Earth

Ancient Earth was a barren waterworld

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Long-sought carbonate minerals found on Mars

Life

Long-sought carbonate minerals found on Mars

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Tonight's Moon is biggest in 15 years

Space

Tonight's Moon is biggest in 15 years

The full Moon will loom larger in the sky on Friday than it has since 1993, as it will be nearly as close as it ever comes to Earth in its orbit

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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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Space

Has an alien comet infiltrated the solar system?

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