The Hubble Space Telescope captured an image of NGC 4694, a galaxy that possesses unusual properties that complicate its ...

Chinese scientists claim they have made a converging energy beam weapon — but did they really, or have they been watching too ...

Miles of air cover Earth. The boundary between Earth's atmosphere and outer space, the Kármán line, is about 62 miles (100 kilometers) above the planet's surface. However, about 99.9% of the mass of ...