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

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

Scientists created the Mars rover's newest self-portrait by stitching together 59 individual images taken by Perseverance 's ...

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.

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