SCIENTISTS have stumbled across a new Super-Earth that orbits inside its star’s habitable zone with a new alien-hunting tool.

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system ...

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, ...

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...

After nearly a decade in orbit, NASA's MAVEN spacecraft has, for the first time, directly observed the process that ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

Scientists may have found a planet orbiting two brown dwarfs at a wild 90-degree tilt—something never seen before.

For this new study, the scientists relied on updated galaxy measurements to factor in the gravitational pull on the Milky Way ...

A collision between our Milky Way galaxy and the neighboring Andromeda galaxy, long considered inevitable, may be in question ...

According to astronomers, the last time this planet came close to the Sun was in 1930. In the same year, Pluto was discovered ...

It is an evocative idea: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all ...

Some astronomers say the strange, clustered orbits of icy rocks beyond Neptune indicate that something big is out there, ...