Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

Would one frozen world, just visible on the rim of the Sun’s kingdom, turn decades of speculation on the concealed layout of ...

Astronomers have hoped for the existence of Planet Nine for years. Things were looking promising, but this discovery might ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

Typically, telescopes are synonymous with bringing far-off objects close, but the newest member of the solar system was discovered using wide-field imaging. The Subaru Telescope has spotted a distant ...

For only the third time in recorded history, an interstellar object has crossed into our solar system, creating quite the ...

Astronomers have discovered a "fossil" world lying in the outskirts of the solar system, according to new research.

CAPE CANAVERAL, Fla. (AP) — Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions ...

Our Solar System possibly survived a supernova because of how the Sun formed The gas that produce stars also cushion them from the blast of nearby supernovae.