NASA astronauts Butch Wilmore and Suni Williams will extend legacies that began with the first U.S. human orbital flights.

Venus is often called "Earth's twin" because both planets are around the same size and density; they are also both rocky ...

Henk Hoekstra is a professor in observational cosmology at Leiden University.

A United Launch Alliance Atlas V rocket is set to launch Starliner and its two passengers, NASA astronauts Suni Williams and ...

The satellite had gone off the grid from radar not once but twice — once in the 1970s and then again in the 1990s.

"This is the second big piece of America's overall strategy for access to low Earth orbit after implementing Dragon." ...

Astronauts who explore Mars should be careful not to leave too heavy of a footprint, experts stress. Indeed, human ...