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Because astronauts used them to observed objects in the sky.
The answer is an umbilical cord. It keeps astronauts from floating out into the universe.
All the astronauts used by N.A.s.A have walked on the surface of the earth.
it is used to take astronauts and cargo into space
It is a place where astronauts conduct experiments
Astronauts fly the craft and participate in experiments. They provide what is commonly called "human intelligence" regarding the outcome of these experiments.
lunar rover
Oxygen (O2).
Practice and lots of trips.
space shuttle
atrophy
doctors