The International Space Station was orbiting above the Northern Territory of Australia when this photograph was taken of the Gulf…
NASA spacewalker Bob Behnken takes a "space-selfie" with his helmet visor up on his U.S. spacesuit.
NASA spacewalkers (from left) Bob Behnken and Chris Cassidy set up the outside of the Tranquility module for the future…
Comet NEOWISE streaked across the sky above the tree line of Lone Pine Lake, located on the Mount Whitney Trail…
Expedition 63 Commander Chris Cassidy shows off the helmet of a U.S. spacesuit during maintenance inside the Quest airlock.
NASA astronaut Chris Cassidy works during a six-hour spacewalk to install lithium-ion batteries on the International Space Station's truss structure.
Expedition 63 Commander Chris Cassidy took this epic "space-selfie" during his fourth spacewalk this year at the International Space Station.
The sun beams just above the Earth's horizon as Expedition 63 Commander Chris Cassidy (center left) conducts his fourth spacewalk…
The sun beams just below the frame as Expedition 63 Commander Chris Cassidy (near center left) conducts his fourth spacewalk…
Expedition 63 Commander Chris Cassidy conducts a spacewalk to set up the Tranquility module for the future installation of a…
