Outer solar system

Even after decades of observations and a visit by NASA's Voyager 2 spacecraft, Uranus held on to one critical secret -- the composition of its clouds.

What’s the next stop for NASA’s New Horizons spacecraft? Jim Green finds out as he talks to the mission’s Principal Investigator, Alan Stern.

What’s the next stop for NASA’s New Horizons spacecraft? Jim Green finds out as he talks to the mission’s Principal Investigator, Alan Stern.

Three billion miles away on the farthest known major planet in our solar system, an ominous, dark storm is shrinking out of existence as seen in pictures of Neptune taken by NASA’s Hubble Space Telescope.

NASA’s New Horizons spacecraft recently turned its telescopic camera toward a field of stars, snapped an image – and made history.

NASA’s Planetary Science Division Director, Jim Green, talks to NASA Goddard’s Amy Simon, who studies the outer planets Uranus and Neptune.

NASA’s Planetary Science Division Director, Jim Green, talks to NASA Goddard’s Amy Simon, who studies the outer planets Uranus and Neptune.

Heat generated by the gravitational pull of moons formed from massive collisions could extend the lifetimes of liquid water oceans beneath the surface of large icy worlds in our outer solar system.

A researcher has logged two pieces of evidence that may support the existence of a planet that could be part of our solar system, beyond Neptune

The trans-neptunian belt contains four dwarf planets, among which Haumea stands out for its extremely elongated shape and rapid rotation.