In a groundbreaking discovery, astronomers have confirmed the approach of a “wandering planet” into our solar system. This ...

Dwarf planet 2023 KQ14, Ammonite, has a stable orbit that challenges the hypothesis of the mysterious Planet Nine.

The methane gas may constitute a rarefied atmosphere, or it may come from erupting plumes on Makemake’s surface.

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there is a distant Planet Nine out there.

The coldest planet in the Solar System is Uranus, which is surprisingly colder than Neptune due to its unique internal heat loss.

I/ATLAS is a fast, ancient interstellar object. Its odd features fuel both scientific study and speculation. On July 1, ...

NASA spotted a new moon almost at the border of our solar system. Back in 1986, a theory came up that this cosmic body could ...

Astronomers found an atmosphere where they least expected it—clinging to an exoplanet that’s too small, too hot and too old ...

The anomalous nature of the object led astrophysicist Avi Loeb to apply a thought experiment to it, highlighting everything about it that might align with a hypothetical alien spacecraft.

Normally when a medium-size star dies, it blasts away the bulk of material in its system. The Hubble discovery was surprising ...

The rate of finding these distant worlds has recently increased, with astronomers scrambling to accommodate the data ...

The chemical make-up of crystals that formed from magma hint at an increase in the number of meteorites battering Earth’s ...