A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

The Solar System might not be as quiet and orderly as we think. Imagine one day looking up and seeing something strange in the sky, a small speck that grows larger and larger. Soon, it becomes clear: ...

What if a planet slammed into Earth? Could we survive it - or would we even notice it coming? In this lightning-fast Q&A, ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...

A study led by Howard Chen looks to explain what NASA space telescopes are missing in the search for life beyond Earth.

York University planetary scientist Dr. Charles-Édouard Boukaré discusses molten rocky exoplanets: rocky planets so close to ...

Skywatchers who spotted the Jupiter-Venus conjunction on Aug. 12 are in for a dazzling display in the night sky through the end of August, with a "planet parade" building in the eastern sky, with ...

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