An asteroid or comet traveled from beyond the stars to make a close approach to Earth.
A chance encounter with a star shows the dwarf planet Haumea has a ring.
New surveys of the most distant objects in our solar system rule out planet nine, but hints at a possible planet ten.
Rain on early Mars was strong enough to create gully washers.
All it took to verify a lava lake on Io was a fortunate transit by an icy world.
Jupiter has a Great Cold Spot in its upper atmosphere, similar to the Great Red Spot.
ALMA takes a peek at a distant dwarf planet known as DeeDee.
A team of 60,000 volunteers analyzed nearly 5 million objects in 3 days in an effort to find Planet Nine.
The Cassini spacecraft has studied Saturn for more than a decade. Now it’s ready to undertake one last daring mission.