Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

While some users claim to have spotted the cat in seconds, others are still staring at the image minutes (even hours) later ...

New research suggests there may be a hidden population of minimoons lurking near Earth, with fragments of the Moon traveling ...

Researchers at Northwestern University and Israel's Tel Aviv University have overcome a major barrier to achieving a low-cost ...