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"I'm a fairly visual thinker. In doing science, I think in terms of pictures of things happening, and then do the mathematics."
- Gregory Benford

Space Walk  
  Going outside your space craft for a short time.  

This is perhaps the first description of a space walk.

As it was, I took good care to retain a hold upon a projecting portion of the car. Occasionally cautiously releasing my grip, I experienced for a few minutes the delicious, indescribable pleasure of being a little planet swinging through space, with nothing to hold me up and nothing to interfere with my motion.

Mr. Edison, happening to come upon the deck of the ship at this time, and seeing what we were about, at once said:

"I must provide against this danger. If I do not, there is a chance that we shall arrive at Mars with the ships half empty and the crews floating helplessly around us."


(From Spacewalk from Edison's Conquest of Mars)

From Edison's Conquest of Mars, by Garrett P. Serviss.
Published by New York Evening Journal in 1898
Additional resources -

See also the description for the electrical tether from the same story.

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Additional resources:
  More Ideas and Technology from Edison's Conquest of Mars
  More Ideas and Technology by Garrett P. Serviss
  Tech news articles related to Edison's Conquest of Mars
  Tech news articles related to works by Garrett P. Serviss

Space Walk-related news articles:
  - Suit Up! Fifty Years Of Spacewalks Video

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