Gravitational Effects Educational Facts Children's Science Book - Miller, Richard
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Gravity is a force that holds planets and moons in orbit around the sun. The moon has a gravitational pull on oceans that causes tides on Earth. Scientists have studied the effects of gravity on the human body. They have found that astronauts appear weightless in space, but when they return to Earth, their muscle mass is decreased. There have also been studies on common cognitive problems that affect astronauts.

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Gravity is a force that holds planets and moons in orbit around the sun. The moon has a gravitational pull on oceans that causes tides on Earth. Scientists have studied the effects of gravity on the human body. They have found that astronauts appear weightless in space, but when they return to Earth, their muscle mass is decreased. There have also been studies on common cognitive problems that affect astronauts.