Orbital dynamics show that President Trump’s pledge to land astronauts on Mars couldn’t happen until 2029 at the earliest.

The vice president leading Boeing's Starliner spacecraft unit, Mark Nappi, has left the troubled program and was replaced by the company's International Space Station program manager, John Mulholland, ...

Hungary’s Tibor Kapu (from left), India’s Shubhanshu Shukla, Axiom’s Peggy Whitson, and Poland’s Sławosz Uznański-Wiśniewski ...

Wearing the wrong shoe on Earth can lead to injury. Researchers still need to figure out the physical consequences of spending a long time walking around on the Moon.