From a shrinking Mercury to Venus’s runaway greenhouse nightmare, the inner solar system is a story of extremes. This video ...

Earth and Mars were formed from material that largely originated in the inner Solar System; only a few percent of the building blocks of these two planets originated beyond Jupiter’s orbit. A group of ...

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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 ...

Before the solar system had planets, the sun had rings — bands of dust and gas similar to Saturn’s rings — that likely played a role in Earth’s formation, according to a new study. “In the solar ...

Earth's Composition Closely Matches Mars, Suggests New Study On Planet's Origins ...