Astronomers from Princeton and other institutions have discovered the smallest planet found outside of our solar system using a technique that researchers believe will uncover others that potentially ...

(WHTM) – Our solar system has eight (was nine) planets and is roughly 4.571 billion years old. The planets in our solar system include Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune ...

A spacecraft operated by the European Space Agency and the Japan Aerospace Exploration Agency has made its final flyby of Mercury, as scientists now work to guide BepiColombo into the planet’s orbit.

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A groundbreaking study suggests that beneath the frozen surface of Enceladus, Saturn’s smallest moon, there could be vast, ...

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Mercury is the innermost and smallest of the eight major planets in our Solar System, orbiting closest to the Sun. Though ...

"We were finding quite a few Earth-sized things, but not very much smaller than that," said Thomas Barclay, an astrophysicist at NASA's Goddard Space Flight Center and first author of the 2013 paper ...