Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

By doubling the number of known "dark comets," astronomers have been able to split them into two camps depending on their ...

Comets are icy bodies that formed alongside the planets in the early Solar System before being flung into its distant outer ...

A new category of space rock called “dark comets” are proving more common than previously thought, with 14 asteroid-comet ...

The study also reveals that these mysterious objects fall into two distinct groups based on their orbit and size. With this ...

The first dark comet—a celestial object that looks like an asteroid but moves through space like a comet—was reported less ...

This new data reveals that not even all dark comets are the same: there are at least two different kinds. And, in turn, the ...

It’s only two years since known objects that look like asteroids and move like comets became numerous enough to get a name, ...

NASA researchers have discovered seven new dark comets, asteroids that act like comets, and they say there could be even more ...

NASA's discovery of seven new "dark comets" doubles the known population of these asteroid-like objects with cometary ...

Dark comets are a newly defined type of near-Earth object that resemble asteroids but behave like comets, exhibiting dynamic ...

Astronomers unveiled the discovery of seven new 'dark comets' that they believe could be the mechanism by which water enters ...