Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner consistent with a large, distant planet.

While scientists are still trying to confirm Planet Nine's existence, NASA says proving that this ice giant is real would help astronomers explain several mysteries within our solar system.

Using two infrared space telescopes and a 23-year gap, scientists may have spotted a mysterious, slow-moving object beyond ...

The James Webb Space Telescope spotted possible signatures for life in an exoplanet's atmosphere. Still, researchers caution it’s far too early to call the findings definitive ...

The latest discovery was found right on the edge of the solar system, much like the child picked ... so it must be a real kick in the teeth for fans of the dwarf planet that this new kid on the block ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why Pluto isn't a planet.

Earth and Mars are mysteriously low in elements like copper and zinc, which are crucial for planetary chemistry and potentially life. A new study overturns old theories by showing that these elements ...

The possibility of additional planets in our solar system has been proposed many times ... Another mystery is how Planet Nine ...

Revenge of the Savage Planet is a funny game with a colorful world that can occasionally be bogged down with frustrating ...

Vesta might be a shattered remnant of an early planet, not a failed one—forcing scientists to rethink how worlds begin.