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

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

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

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

The object, named 2017 OF201, has a diameter of about 700 kilometers, according to a preliminary study - It is three times as ...

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

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

A recent paper reveals we're almost certainly going to collide with a galaxy in the next couple billion years, but it's not ...

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

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

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