THAT’s NO MOON - Earth doesn’t just have one moon; sometimes, it has a companion satellite or “mini-moon.” Discovered on ...

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Our solar system now, once again, officially consists of only eight planets. Although largely debunked, speculation continued ...

Exoplanet hunters Christopher Watson and Annelies Mortier explain the long search for a 'twin Earth' capable of sustaining ...

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 ...

Please enable JavaScript to read this content. Detailed maps of Mercury's cliffs and ditches show the solar system's innermost and smallest planet Mercury has lost ...

What was discovered in Flagstaff, Arizona, and killed off in Prague? If you answered "Pluto's planethood," your grasp of the astronomical is excellent. Feb. 18 marks the 95th anniversary of the ...

SANTIAGO (Reuters) - Scientists searching for a planet like Earth said on Tuesday they have found the smallest planet ever detected outside the solar system, less than twice the size of our own. The ...

CAPE CANAVERAL, Florida (Reuters) - Detailed maps of Mercury's cliffs and ditches show the solar system's innermost and smallest planet Mercury has lost much more real estate due to cooling over four ...

SEATTLE – NASA has discovered the smallest planet ever seen beyond our solar system – a rocky world just 1.4 times larger than Earth – using its planet-hunting Kepler observatory. The planet, called ...