Retired astronaut Chris Hadfield chats about the existence of aliens and extraterrestrial life. Hadfield is the first Canadian astronaut to walk in space and the best-selling author of "An ...

Williams, who initially embarked on an eight-day mission with fellow astronaut Butch Wilmore, ended up spending nine months ...

An curved arrow pointing right. Retired astronaut Chris Hadfield chats about the existence of aliens and extraterrestrial life. Hadfield is the first Canadian astronaut to walk in space and the ...

Indian-origin NASA astronaut Sunita Williams, currently board the International Space Station (ISS), has clicked the "ultimate selfie." The photograph, shared by NASA on Instagram, was captured ...