Scott Kelly and Mark Kelly

NASA Twins Study Shows What A Year In Space Did To Scott Kelly's Body

Many of the changes Scott Kelly experienced in space returned to normal after he came back to Earth, but not all of them.

  Spaceflight

0:52SpaceX's Falcon Heavy rocket.
SpaceX

SpaceX Successfully Launches Falcon Heavy On First Commercial Mission

1:03A full moon
Getty Images

Israeli Spacecraft Falls Short Of Landing On The Moon

1:44An illustration showing Crew Dragon docking with the International Space Station
SpaceX

What's Next For Commercial Spaceflight After The Crew Dragon Launch?

1:13SpaceX's Crew Dragon Capsule is retrieved from the Atlantic Ocean
NASA

SpaceX Crew Dragon Capsule Successfully Returns To Earth

1:28A waning crescent moon rises above the Wasatch Mountains by Salt Lake City, UT
NASA / Bill Dunford

Don't Have The Money To Fly Spacecraft To The Moon? Borrow Gravity

1:31Plants growing aboard the International Space Station
NASA

The Promise Of Space Gardening

1:17A composite image of the far side of the moon as captured by the Lunar Reconnaissance Orbiter
NASA

What We Can Learn From China's Unprecedented Far-Side Moon Landing

1:25A artist's rendering of New Horizons flying by 2014 MU69
NASA / Alex Parker

NASA Rang In The New Year With A Historic Flyby

1:20Concept art of OSIRIS-REx approaching the surface of asteroid Bennu
NASA / Goddard Space Flight Center

How A NASA Probe Will Orbit An Asteroid With Almost No Gravity

1:29A photograph of Earth, taken during the Apollo 8 mission
Project Apollo Archive

How Apollo 8 Changed Spaceflight History In Only Four Months

1:16Virgin Galactic SpaceShipTwo
Virgin Galactic

Virgin Galactic Successfully Tests Commercial Spacecraft

1:20An artist rendering of Juno above Jupiter
NASA / JPL-Caltech

As Juno Nears Middle of Jupiter Mission, NASA Shares Newest Findings

0:54NASA administrators address an audience
NASA

NASA Outsourcing Next Moon Landing To Private Company

1:21MarCO CubeSats over Mars
NASA Jet Propulsion Laboratory

Tiny CubeSats Sent Word Of InSight's Landing All The Way From Mars

0:54The Soyuz MS-10 spacecraft
Getty Images

Russian Soyuz Rocket Will Launch Again In December

0:52NASA's ADEPT system sits on a table
NASA Ames Research Center / Dominic Hart

NASA's New 'Umbrella' Could Help It Deliver Bigger Payloads

2:21Rover on Mars
Getty Images

The Modern Space Race To Prepare For War Beyond Earth

1:26The Curiosity mission approaches Mars
NASA

For Future Astronauts, It's A Good Thing Mars Gets This Close

0:43Soyuz landing
NASA

3 Astronauts Back On Earth After 5 Months In Space

0:32SpaceX Falcon 9 rocket
Getty Images

SpaceX Scrubbed Its Launch At The Last Minute

1:40A coronal mass ejection
SOHO (ESA and NASA)

Why Experts Say We Should All Pay More Attention To Space Weather

0:43SpaceX Falcon Heavy launch
Getty Images

SpaceX May Not Be To Blame For Lost Spy Satellite After All

1:12Former NASA Astronaut Buzz Aldrin walks on the surface of the moon
NASA

A Tabloid's Claim That Buzz Aldrin Saw Aliens In Space Is Way Off

1:37A Tesla Roadster in Earth orbit
SpaceX

Those Pictures Of The Tesla In Space Might Have Been Illegal

1:24International Space Station
NASA

What Will Happen When The International Space Station Crashes

1:22A rendering of Tiangong-1 re-entering the atmosphere
The Aerospace Corporation

Why It's Hard To Know Where Or When China's Space Station Will Crash

1:33A crate of lunar samples
NASA

When's The Best Time For NASA To Open Its Last Lunar Samples?

0:58The International Space Station
NASA

Trump's Commercial Space Station Proposal Isn't A New One

1:34SpaceX's Dragon capsule entering Mars' atmosphere
SpaceX

After Falcon Heavy, What's Next For SpaceX?

1:08SpaceX's Falcon Heavy lifting off amid a dust cloud
Getty Images

SpaceX's Falcon Heavy Launch Was Impressive Despite Years Of Delays