Why does the planet Uranus have rings?

Answer 1

The rings of Uranus are made of dark particulate matter (as opposed to the ice composition of the rings of Saturn). They may have been created by the collision of small moons in their orbits around the planet. The more visible rings seem to have larger particles, ranging from .2 to 20 meters in size, while the fainter ones are mostly dust.

Thirteen distinct rings are presently known, the brightest being the "epsilon" ring. This ring has little dust and appears to be extremely thin, as little as 150 meters in thickness.

Answer 2

Astronomers currently think the rings formed when some of the planet's moons collided with each other.

Unlike Saturn's rings, Uranus' rings are faint and difficult to see. As of 2015 astronomers have identified at least 13 distinct rings.