A decades-old cosmic mystery may finally be solved. Scientists now suspect that the strange X-ray glow from a distant white ...

For centuries, planets beyond our solar system—called exoplanets—existed only in theory and science fiction ... star passes directly in front of a background star, as seen from Earth.

Scientists have discovered a new planet, Enaiposha, that defies existing planetary classifications. Found 47 light-years away ...

So what does such a planetary alignment mean for science? Well, truthfully, not much. A planetary alignment occurs "when the planets 'line up' on the same side of the sun, generally speaking ...

Opinion is divided over how big this hypothetical planet might be. Astronomers from Japan think it could be three times as big as Earth but Live Science believes the "enigmatic entity" is ...

Many of you, like myself, were probably taught in grade school that Pluto was the ninth planet in our solar system, and, ...

For the first time, scientists have been able to map the atmosphere of WASP-121b - also known as Tylos - in 3D and what they found sounds like something out of science fiction. The planet is 900 ...