The nights surrounding June 7 will see Jupiter and Mercury crowd together close to the horizon in the northwestern sky. Stargazers in the U.S. will need a clear horizon to spot the planetary duo ...

As astronomers study an exoplanet called K2-18b, conflicting research reveals how difficult it is to find evidence of life ...

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.

The discovery of the exoplanet, a super-Earth called Kepler-735c, is all down to something called transit timing variations, ...