Humans in Space: Incredible NASA Spacewalk Pictures [Big Picture]

Here’re the best and most breathtaking NASA images of astronauts’ spacewalks during Space Shuttle Discovery last mission to the International Space Station.

The space walk, also known as extra-vehicular activity, essentially “may be either tethered (the astronaut is connected to the spacecraft; oxygen and electrical power can be supplied through an umbilical cable; no propulsion is needed to return to the spacecraft), or untethered.”

Here’re the breathtaking views of spacewalks with our beautiful blue planet. Space Shuttle Discovery (SSD) made its last appearance to the  International Space Station (ISS) and the Astronauts had a few Spacewalks. We have put together the best and most breathtaking NASA images of these spacewalks and previous spacewalks throughout history. [WiKi via Trigger Pit]

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