Good question! It seems funny that astronauts
need to wear a helmet out in space when there is
nothing to bump their heads on! Astronauts wear
special suites (and helmets) in space because
the pressure is so low. The suits that
astronauts wear are pressurized to simulate the
pressure that humans live in on Earth. The
Earth’s atmosphere is composed of gas (mostly
nitrogen and oxygen), and the gas basically
weighs down on the surface of the Earth. The
weight of the atmosphere increases the pressure
of the air that we live in. The pressure at the
surface of the Earth is just right for humans
and other animals and plants to live. Out in
space there is very little gas, so the pressure
is very low– way too low for people to survive
in. We need the pressure to be just right.
Likewise, people could not live at the bottom of
the ocean because the pressure from the weight
of all of the water would be way too high.
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