Earth may once have had two moons, the one that shines at night today and a smaller companion, according to a new theory.
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Earth 'could have had two moons'
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Solar and partial lunar eclipse expected this month
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Who owns the Moon?
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Humans may have used fire one million years ago
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Jupiter apparently smacked by rogue object, new images reveal
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Jupiter and Venus to appear side by side
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Planets may assemble around stars more quickly than anyone thought possible
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Releases of potent greenhouse gas may have helped end ice ages
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It came from outer space
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Prescience, Perpetual join forces
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Discovery could lead to new way of producing electricity
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Human remains may be 500 years old
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Balloons light up the night sky
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Earthquake counts go up as moon comes closer to Earth:
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Comet coming in 2013 near earth, could be brighter than full moon
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Mars, Mercury may have formed from Earth and Venus
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Stars move off the bottom