as·tro·naut

[as-truh-nawt, -not]
noun
a person engaged in or trained for spaceflight.

Origin:
1925–30; astro- + (aero)naut, probably via French astronaute; see astronautical

astronaut, cosmonaut.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Astronauts is always a great word to know.
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an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
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The landers, rovers, and other junk left on the lunar surface by the astronauts
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The storms can knock out satellites, disrupting communication, and endanger
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We'll start by sending astronauts to an asteroid for the first time in history.
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