The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Gaia-4b is considered a super-Jupiter planet, a relatively cold gas giant, orbiting its star over 570 Earth-days. That star ...

Charon is the largest moon of the dwarf planet Pluto, but calling it a moon ... Christy had been imaging Pluto with the USNO's 1.5-meter (4.9-foot) telescope. Because Pluto is so far from the ...

The organic material found in a few areas on the surface of dwarf planet Ceres is probably of exogenic origin. Impacting asteroids from the outer asteroid belt may have brought it with them. In the ...