The pair live-stream the spacewalk from their helmets
The universe has been around for 13.8 billion years, and has been gorgeous for every one of them—as this year-end collection of images from 2013 helps prove.
Update, 2 p.m. ET: The astronauts have finished their repairs, reports NBC News.
U.S. astronauts Rick Mastracchio and Michael Hopkins are making a rare Christmas Eve spacewalk to fix vital cooling systems on the International Space Station.
The first men to orbit the moon knew they were on an epic journey, but they never imagined the impact of a single image
A malfunctioning pump has halted research and left the International Space Station vulnerable
Conversed with astronauts on International Space Station
Data from the mission could help scientists determine the Milky Way’s origin
A 12-year galactic survey unveils two overlooked arms
After cooling system breaks down
Even the failed star known as a brown dwarf may have planetary company