Astronomers have discovered what they think may be another moon orbiting a distant dwarf planet called Quaoar. This small, ...

Three celestial bodies are preparing to meet up for one night in September in a cosmic conjunction that should be widely visible in the sky.

But it’s not just looks. Rocky composition, general size, orbital behaviors—a lot of those qualities can be the same on both ...

Is the moon a star or a planet? The correct answer is "neither," but that's not the consensus reached when the argument comes up in this funny TV clip. During a recent show for the QVC shopping ...

"The profile of the occultation was most consistent with it being a new satellite — a new moon — going around Quaoar." ...

And speaking of the break of dawn, that happens nowadays at around 5:15 a.m. local daylight time. And that's the time for ...

This was an unexpected and coincidental discovery of a small, icy, egg-shaped planet in the outermost reaches of our solar ...

A rocky, Earth-size planet located in our Milky Way galaxy may have an atmosphere around it, according to new research, ...