Over the last ten years, OPAL has observed Uranus' northern hemisphere, which has faced the inner solar system for the ...

NASA's Hubble Space Telescope is helping scientists solve a longstanding mystery about Saturn's rings. Some new images reveal mysterious shadows known as "spokes" that move along the rings.

NASA and ESA’s Hubble Space Telescope has been observing the outer planets through a program called OPAL (Outer Planet ...

Encountering Neptune in 1989, NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer ...

Saturn's famous rings are about to disappear. No, not literally – that isn't projected to happen for hundreds of millions of years. But for astronomers and stargazers using ground-based ...

Saturn has at least 146 moons, of which 63 are named—and thousands of moonlets are hiding inside its rings. Four of our planets have rings, but Saturn's are enormous and complex, in a class of ...

Encountering Neptune in 1989, NASA's Voyager mission completed humankind's first close-up exploration of the four giant outer ...

This is a montage of Hubble Space Telescope views of our solar system's four giant outer planets: Jupiter, Saturn, Uranus, and Neptune, each shown in enhanced color. The images were taken over nearly ...

Hubble’s OPAL program tracks Jupiter, Saturn, Uranus, and Neptune Seasonal and atmospheric changes revealed over a decade Key insights into gas giants’ weather systems shared by NASA ...

A NASA Hubble Space Telescope observation program ... Major changes happen when Saturn progresses into the next season. Saturn's mysteriously dark ring spokes, which slice across the ring plane ...

Saturn also experiences auroras, known as northern and southern lights. In this image, Hubble ultraviolet-light observations of an aurora are superposed on a visible-light image of the planet.