ESA's Euclid mission is exploring the "dark universe." The space telescope's latest images offer fascinating new insights.

Despite finally returning to Earth Butch and Suni still have an uphill battle with getting their health back on track ...

NASA astronauts splashed down in the Gulf on Tuesday, returning home after an unexpected 9-month stay in space.

Discover what astronauts experience physically and emotionally after returning from space. Learn about the scientific effects ...

Developed in 1915, general relativity suggests that gravity arises because bodies with mass cause the fabric of spacetime (the four-dimensional unification of space and time) to warp. The greater ...