Spaceship Earth?

This post contributed by Liza Lester, ESA communications officer Astronaut Bruce McCandless II drifts free, 350 kilometers above Earth’s surface and 100 meters from the safe haven of the Space Shuttle Challenger, during one of NASA’s first un-tethered spacewalks (credit, STS-41B, NASA 1984, via the Astronomy Picture of the Day). Invisible bonds of absolute necessity hold the free-flying astronaut to his shuttle, and to Earth below. He...

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