There's no shortage of round celestial objects in our universe. Planets, moons and stars all exhibit lovely spherical shapes.

Astronomers have discovered a strange new object in our Milky Way galaxy. The celestial object is emitting X-rays around the ...

A celestial object some 15,000 light-years away is emitting bright flashes of radio and X-rays that scientists are struggling ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

Using a newly developed adaptive optics system called Cona, scientists peered through Earth's turbulent air to reveal the sun ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

China's space agency says it has launched a spacecraft that promises to return samples from a pair of asteroids near Mars and ...

Tianwen, which means "questions to heaven," is the name given to China's program of robotic Solar System exploration. Tianwen ...