Jupiter is already the biggest planet by far in our solar system, but new research suggests it was somehow once even larger than it is now. Twice as large, in fact. To put that into context, those ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

The James Webb telescope has made another stunning discovery -- this time of a massive planet that could potentially sustain ...

Some became rocks the size of baseballs, others the size of a house, and a few as big as a planet. This process, called accretion , is how everything in the solar system – planets, moons, comets ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

WASHINGTON (Reuters) -In addition to providing a trove of information about the early universe, the James Webb Space ...

An "interstellar object" is speeding toward the inner solar system, where Earth is located, astronomers have confirmed.

The exoplanet, a planet beyond our solar system, has been dubbed TWA 7b after NASA's James Webb Space Telescope captured ...