This Jan. 2, 2010 image made available by NASA shows the planet Saturn, as seen from the Cassini spacecraft. On Monday, new research suggested that Saturn’s rings may be older than they look ...

Figuring out the day length of Earth is more complicated than you might imagine. While on average a day is 24 hours long, throughout the year the planet's rotation can speed up and slow down, with one ...

Saturn is, of course, famous for its rings, but in our solar system there are actually four planets with ring systems of one size or another. Every gas giant in our solar system has a ring -- that ...

A newly discovered exoplanet contains 37 rings nearly 200 times larger than Saturn's ring system. To boot, a large gap in the rings suggests the presence of at least one Earth- or Mars-size exomoon.

The planet itself doesn’t show up in the observations, but that could be explained if the ring system is slightly off-center as it moves in front of the star.

Scientists say that Saturn's rings are falling in on the planet as icy rain due to the gas giant's intense gravity. Saturn's rings are made of pieces of comets, asteroids or moons.

Just on the outskirts of our solar system exists the dwarf planet Quaoar, and recent observations of the planet found a dense ring around it, but scientists can't figure how – or why – it's there.

That’s how many kilometers Quaoar’s rings are from the dwarf planet’s core. That puts its rings at a distance of roughly 7.4 of the dwarf planet’s radii from its core—twice as far as the ...

The ring in question orbits Quaoar, a small dwarf planet that lies more than 4 billion miles from the sun—roughly 44 times the distance between Earth and our star.

The rings around the giant planets of the solar system — Jupiter, Saturn, Uranus and Neptune — generally fit within the constraints of the Roche limit.