Edward White became the first U.S. astronaut to walk in space when he stepped outside his Gemini 4 spacecraft.

CNN: Tuesday,

Sullivan (the first American woman to walk in space).

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In addition city plans say that by 2015, 90% of residents will be able to walk to a green space in just 15 minutes.

BBC: What Copenhagen can teach the world

Some ridiculed this journey to outer space in the same way as the idea that people could walk on the moon was once scorned.

FORBES: SpaceX: The Enterprise Voyages Begin

The imagination of scientists has enabled us to travel through outer space and walk on the moon, feats that were once only possible in the realm of myth.

NPR: Karen Armstrong: Myths and the Modern World

In February 2010, he is scheduled to go into space again and will be making his first space walk.

BBC: 'Never cut your hair in space'