After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the Kuiper Belt beyond Neptune — and they may soon have the opportunity to find ...

They sometimes call it the Goldilocks zone — not too hot, not too cold. The habitable zone is the region of our Solar System ...

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turning this into a planetary parade of all seven planets in our solar system other than Earth. It will be difficult to see them all since Saturn, Mercury and Neptune will be quite close to the ...

NARRATOR: The largest volcanoes discovered in the solar system so far are right next door. Mars is one of the most explored and photographed of all the planets beyond Earth. We've captured its ...

The historic probes are the farthest human-made objects from Earth. Just how far they've gone will blow your mind.

It would depend on a lot, say our readers, from how big it was to the route it took - but it could have significant ...

Researchers have developed a new method using the Allen Telescope Array to search for interplanetary radio communication in the TRAPPIST-1 star system. A new technique allows astronomers to home ...

And what if nothing shows up at all? It would still be useful to know for sure how many planets there are, Rice said. “I think not even knowing the number of planets in our own solar system is ...