The LHS 1903 system defies expectations with a rocky outer planet, prompting new ideas about how planets form and evolve.

Neptune is the solar system's most distant planet, a cold, blue ice giant sitting nearly 30 times further from the sun than Earth. At that remote distance, temperatures plunge to nearly minus 200 ...

It is a question that feels like it should have a straightforward answer: how many planets are there in our solar system? Since Pluto was relegated back down to dwarf planet status, almost everyone ...

Scientists are grappling with a cosmic mystery: why does the Universe behave differently on massive scales compared to our ...

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically ...

Rather than slowly condensing over millions of years, the first building blocks of Earth and other planets may have formed ...

"Each interstellar comet brings a little bit of its history, its fossils, from elsewhere." ...

Interstellar comet 3I/ATLAS is now on its way out of our solar system, never to return. The comet was only the third-ever ...

TUCSON, Ariz. (KVOA) - Astronomers have confirmed a new planet in one of the youngest solar systems ever found, thanks to University of Arizona technology. The system, called WISPIT 2, was first ...

Astronomers have found a second planet that is in the process of forming in a dust cloud around a young star called WISPIT 2 — providing a glimpse of the birth of a solar system 1. Chloe Lawlor at the ...

Ultra-faint dwarf galaxies orbiting the Milky Way are cosmic fossils. New simulations reveal how these tiny systems reflect ...