When you look at the solar system, you might notice that the planets' orbits are tilted, and oddities in the protoplanetary ...

A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...

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

Voyager 1 has been exploring the cosmos for decades, but when it reached the edge of the solar system, it found something ...

A recent study by Princeton University astronomers suggests the possible existence of a previously undetected planet in our ...

The interstellar object hurtling toward the inner solar system, where Earth is located, is much larger than previously ...

Astronomers have discovered an alien world that defies every planetary rule with its massive size, low density, and tilted ...

The James Webb Telescope captures the beginning of planetary formation around the young star HOPS-315 for the first time.

The birth of a new solar system may have been caught on camera. About 1,400 light-years from Earth sits a young sunlike star surrounded by cooling gas and teensy silicate minerals. These mineral ...

From lava worlds to gas giants, NASA says the variety of these worlds is staggering—and that signs of a further 8,000 distant ...

Jim Bell, astronomer and former president of The Planetary Society, explains the uniqueness of the interstellar 31/ATLAS ...