Historic footage from Apollo 9 shows the first full test of true spacewalk systems in Earth orbit. What may look unstable is normal in microgravity, as visor and checklist hardware float freely. This mission proved astronauts could work safely outside a spacecraft before going to the Moon. Follow @spaceeves #Apollo9 #Spacewalk #NASA #SpaceHistory | SpaceEve

The longest spacewalk ever by American astronauts took place in 2001 and lasted almost nine hours. Do you know how long the very first U.S. spacewalk lasted? | NASA's Johnson Space Center