How many dwarf planets are there in our solar system? The recent discovery of 2017 OF201 makes the tally anywhere between ...

I/ATLAS, earlier known as A11pI3Z, is only the third interstellar visitor to be discovered passing through our corner of the ...

– Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago. Then the planets began to ...

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 ...

Astronomers have discovered a new interstellar comet passing through our solar system, marking the third interstellar object ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

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 ...

Reuters, the news and media division of Thomson Reuters, is the world’s largest multimedia news provider, reaching billions ...

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

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 ...

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 ...