But there's enough debris from the ice giant to last for quite a while.

Astronomers sometimes place them in a separate category called "ice giants".

For this reason, astronomers sometimes place them in a separate category called "ice giants".

For these reasons, some astronomers suggest they belong in their own category, "ice giants".

The ice giants, with only a few Earth masses of nebular gas, never reached that critical point.

A dark ice giant, the planet orbited beyond the one they knew as Pluto.

The probability for any planetesimal to be captured by an ice giant is relatively high, a few 10.

In the realm of the ice giants, Uranus has 27 known moons.

Enormous chunks of rubble rained down onto the ice giants.

Many argue that the differences between the ice giants and the gas giants extend to their formation.