Sunita Williams spent a total of 608 days in orbit, the second-highest total among NASA astronauts. She also performed nine ...

Sunita Williams has retired from NASA, closing a 27-year career defined by endurance, leadership, and record-setting missions ...

Veteran NASA astronaut Suni Williams announced her retirement Tuesday. Her extended mission to orbit due to the troubled Boeing Starliner test flight was her final foray.

The Mars Express orbiter launched to the Red Planet. Twenty years later, ESA has delivered a high resolution color image of ...

Mars is famous for its volcanoes, canyons and ancient river valleys, but some of its most active geology happens in slow ...