Science
Resetting the Theory of Time
21:02
Space
After a half-year mission at the International Space Station, Canadian astronaut Chris Hadfield lands in central Kazakhstan on Tuesday.
Astronaut Chris Hadfield's Most Excellent Adventure
()Hadfield just spent 146 days up at the International Space Station, during which time he performed rock concerts and shared his dazzling photographs with nearly a million Twitter followers.
Monkey See
'Space Oddity' In Space: Yes, Astronauts Are Still The Coolest Humans()
May 13, 2013 If you were an astronaut, isn't a David Bowie cover what you'd be doing?
The Two-Way
Astronauts Go On Spacewalk To Fix Ammonia Leak()
May 11, 2013 NASA sent two astronauts on a spacewalk Saturday to fix an ammonia leak in one of International Space Station's power systems.
Astronauts Plan Spacewalk To Plug Space Station Leak()
May 11, 2013 The leak in a cooling system was discovered Thursday when "snowflakes" of ammonia were seen flying away from the station. Engineers on Earth were up overnight plotting an impromptu spacewalk.
The Two-Way
Spacewalk Planned To Repair Station's Leaky Cooling System()
May 10, 2013 Astronauts discovered an ammonia leak in a system designed to keep the International Space Station's power supply cool.
Author Interviews
Buzz Aldrin's Case For A 'Mission To Mars'()
May 9, 2013 In Mission To Mars, astronaut Buzz Aldrin lays out his plans for getting Americans on Mars by 2035.
Krulwich Wonders...
Our Very Normal Solar System Isn't Normal Anymore()
May 7, 2013 Turns out our solar system — with its medium sized sun, its four small rocky planets, its four big gassy ones farther out — isn't like the others. We are unusual. Very unusual. Says one prominent astronomer, we are "a bit of a freak."
