Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper belt.

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

When you think of threats from outer space, you might picture deadly solar flares, planet destroying asteroids, or even a hostile alien invasion. But scientists warn that the biggest danger could be ...

Astronomers have, for the first time, detected a planet growing inside a cleared gap of a protoplanetary disk, confirming long-held theories about how young planets shape their star systems.

Independent previous research has also proposed a similar Planet Y to explain the warp or other features in the TNO ...

A mysterious new world may be hiding in the outer reaches of our solar system. According to arecent study published on arXiv ...

Scientists have developed a new and improved method to better understand "steam world" exoplanets, a move that could refocus ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all our efforts to spot it.

Penn State astronomers are using data from NASA’s James Webb Space Telescope, combined with theoretical models, to ...

Most planet-forming disks have warps that can lead to planets on inclined orbits, which could explain where the tilt of Earth's orbit came from.