“Uranus and Neptune are commonly considered ice giants, ... “Our random model generator shows that such methane-rich planets can fit the observed properties of Uranus and Neptune. ...

Size: About 4 Earths would fit side by side across the face of Uranus. Its diameter is 31,800 miles (51,100 kilometers), making it the third-largest planet in the solar system.

On January 21, six planets—Venus, Mars, Jupiter, Saturn, Uranus, and Neptune—will be visible simultaneously in the sky, and their alignment will be easily visible from almost all parts of the ...