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A

astronaut

a person who travels in space

astronomy

the scientific study of stars and the universe

asylum

political protection given by a government to a person from another country

at

in or near ("at the edge"); where ("look at"); when ("at noon")

atmosphere

the gases surrounding any star or planet

atom

a very small part of all things; the smallest part of an element that can join with parts of other elements

attach

to tie together; to connect

attack

a violent attempt to damage, injure or kill; v. to start a fight

attempt

to work toward something; to try; to make an effort

attend

to be present at


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