Scientists are tracking a large gas planet experiencing quite a quandary as it orbits extremely close to a young star - a ...

Some scientists hypothesize that a mysterious, gigantic 9th planet may be lurking at our solar system’s edge. Why haven't we ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

Astronomers have achieved a first in exoplanet hunting by using the Hubble Space Telescope images to investigate a mysterious ...

Despite this, "people have considered a whole host of different orbits for these hypothetical planets," Chad Trujillo, an astronomer at Northern Arizona University, said to Science News. "This object ...