The Hubble Space Telescope has peered at Uranus, left, and Neptune to study the so-called "ice giant" planets, but little is known about their interior composition. - NASA / ESA / M. Showalter / L.

The ice giant Neptune will be at opposition on Tuesday (Sept. 19), meaning it will be in a straight line with our planet and the sun, with Earth in in the center. The eighth and most distant planet ...

The half-lit lunar disk will rise alongside the ringed giant Saturn and dimmer Neptune in the early morning hours of June 19, putting on a spectacular show just six hours after the moon hits its third ...

Have you ever found something unexpected in your hamburger? Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) were surprised to discover the very earliest phases of giant ...

In our Solar System, four planets stand out for their sheer mass and size. Jupiter, Saturn, Uranus and Neptune indeed qualify as “giant planets” because they are larger than any terrestrial planet and ...

Scientists may finally have an answer for why the ferocious jet streams on the solar system’s giant planets blow in opposite directions — eastward on gas giants Jupiter and Saturn, and westward on ice ...

The ice-giant Neptune, the most distant and third largest planet in our solar system, is a distinctive dark blue ball of gas, which may appear calm but is actually throttled by a chaotic atmosphere.

Images taken by the Hubble Space Telescope document the formation of a Great Dark Spot on Neptune for the first time, report researchers in a new study. Like Jupiter’s Great Red Spot, Neptune’s Great ...