5 planets will align in an arc across the night sky tonight

Milky Way stretches across the clear night sky in this undated file photo. (Peter Komka/MTI via AP) Milky Way stretches across the clear night sky in this undated file photo. (Peter Komka/MTI via AP)

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How the lack of gravity in space impacts astronauts’ brain

What happens to the brain when you take gravity away? According to a new study looking at astronauts both before and after space travel, that experience causes physical changes that researchers believe requires at least three years between longer missions to recover from.

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