NASA astronauts Christina Koch and Jessica Meir are scheduled to begin the first-ever all-female spacewalk today (Oct. 18) at around 7:50 a.m. EDT (1150 GMT). Watch it live at Space.com.
The robotic X-37B has been circling Earth for nearly 719 days on its latest mystery mission, which is known as Orbital Test Vehicle 5 (OTV-5).
The U.S. Air Force's X-37B military space plane has now been circling Earth for 700 days, just a few weeks shy of the vehicle's spaceflight-duration record.
Supergravity has inspired physicists for decades and may contain deep truths about the nature of reality.
The president had confidence NASA could win the race to the moon, despite the Soviet Union's previous successes.
Such a mission would have to keep two spacecraft, separated by thousands of miles, aligned within 3 feet of each other.
A new instrument designed to find potentially habitable alien worlds in the nearest star system to our own sun just revved up.
Israel's first moon lander came up just short in its historic touchdown bid this afternoon (April 11).