According to a new study, our system was once home to a fifth gas giant that suddenly vanished some 4 billion years ago after a run-in with Neptune.

Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Planet Nine, a hypothetical, undiscovered planet in our solar system. New research now suggests the ...

A star and its planets form when a cloud of gas and dust collapses in on itself somewhere in space. The cloud then forms a ...

There's a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic mystery. Astronomers have cataloged a frozen minor planet called 2017 OF201, ...

Add Yahoo as a preferred source to see more of our stories on Google. The 15 planet-forming disks around young stars that have been studied in detail by exoALMA. Here we see the disks in light emitted ...

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The giant planets weren't always where we find them today. Jupiter, Saturn, Uranus and Neptune formed in a more compact configuration and later underwent a violent reshuffling that scattered them to ...

Sheppard joined Carnegie as a prestigeous NASA Hubble Fellow in 2004 and was appointed to a faculty position in 2007. He ...