A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...

Astronomers find evidence of a possible ninth planet beyond Neptune, reigniting the debate about the formation of the Solar ...

Artist's impression of Planet TOI-6894b, a low-density gas giant orbiting the star (TOI-6894) - the lowest mass star to have ...

PARIS: Astronomers announced on Wednesday they have discovered a massive planet orbiting a tiny star, a bizarre pairing that ...

One of the more poignant moments in the movie Star Wars, is when Luke Skywalker gazes wistfully into the sunset on the planet ...

Jupiter may have once been more than twice its current size, with a magnetic field 50 times stronger, say scientists who ...

HAT-P-1b is one of the 200 or so planets that have been detected outside our Solar System. It has the largest radius ... Several ideas had been proposed solve the puzzle but none seemed to quite fit, ...

Astronomers spotted water around a young, sun-like star for the first time ever, and it could help us understand solar system formation.

Play the USA TODAY Daily Crossword Puzzle. Here is everything ... While it's no longer officially a planet, Pluto remains a fascinating and beloved part of our solar system with a slightly less ...

"For years, conflicting gravity data from Dawn's observations of Vesta created puzzles," Park said ... is a chunk of a differentiated planet from early in the Solar System is also unproven.