A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond ...

A few decades ago, the Solar System had nine planets, but in 2006 the International Astronomical Union reclassified Pluto as ...

Six planets will seem to line up along their orbits, with four of them bright enough to be visible without a telescope ...

The discovery of two new planets beyond our solar system by a team of astronomers from The University of Warwick and the ...

The Webb telescope — a scientific collaboration between NASA, ESA, and the Canadian Space Agency — is designed to peer into ...

A strange asteroid-comet hybrid that orbits between Jupiter and Neptune could reveal key details about the birth of our solar ...

"There are still many things related to planetary formation and the early evolution of young planetary systems that we don't ...

The potential discovery of a large planet beyond Neptune’s orbit could change everything we know about the Solar System.

These solar system objects are like icy asteroids and have orbits comparable to or larger than Neptune's orbit. Prior to the new UCF-led study, TNOs were known to be a diverse population based on ...

“Our own solar system is done making planets and all we have are the leftovers ... Distance is also a challenge since the ...

Outer dark comets are larger – about a mile wide in size – and on more elliptical orbits farther out in the solar system. Inner dark comets are smaller – typically 1,000 feet in size – and on circular ...

Outer dark comets are larger—about a mile wide in size—and on more elliptical orbits farther out in the solar system. Inner dark comets are smaller—typically 1,000 feet in size—and on ...