In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds ...

Wide-orbit planets are fairly common according to the study, and there's a good chance we have one of our own.

New research shows there is at least a 40% chance of the existence of Planet Nine, but scientists are still looking for ...

If our solar system seems stable, it's because our short lifespans make it seem that way. Earth revolves, night follows day, ...

NASA launched two 12-inch gold-plated copper disks filled with the sounds of children's laughter, heartbeats, and bird calls.

Tax credits for clean energy and home energy efficiency would still be phased out, albeit less quickly, under Senate ...

An accidental discovery in an astronomy show offers researchers a new clue about the mysterious Oort Cloud, a large expanse of icy bodies revolving around the sun.

The curious minds at What If investigate the cosmic chaos caused by swapping the orbits of certain planets in our solar system ... sanctuary jurisdictions' list vanishes after pushback from ...

A composite image comparing the relative sizes of our solar system's known dwarf planets, including the newly discovered 2017 OF201. | Credit: Sihao Cheng et al. Scientists have found evidence of ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be fair—but one of the largest yet discovered and with an orbit around the Sun that ...

This article was originally featured on The Conversation. Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A ...

Some experts remain unconvinced about this discovery. It’s been almost two decades since our solar system lost its 9th planet. Pluto was officially reclassified from a planet to a dwarf planet ...