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comment by AhimMoonchowsen
AhimMoonchowsen  ·  4815 days ago  ·  link  ·    ·  parent  ·  post: NASA Timelapse of Southern Lights from ISS
Great video, beautiful.

This led me here: http://www.youtube.com/watch?v=T0xaCYo2d6Q

A good refresher course on escape velocity and orbiting velocity.