Our solar system appears beautifully organized, but its stability is actually the result of an incredibly delicate cosmic ...

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The four rocky worlds closest to the sun share a common ancestry but have followed radically different paths. Mercury is still shrinking as its interior cools. Venus traps so much heat that its ...

A hot, rocky planet discovered using the Kepler space telescope is the smallest ever found outside our solar system. The new planet, called Kepler-37b, has a radius less than a third the size of Earth ...