Astronauts float around in space because there is no gravity in space. Everyone knows that the farther you get from Earth, the less the gravity force is.
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The Moon is the large round object that circles the Earth and that shines at night by reflecting light from the sun.
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People usually say Earth when they are referring to the planet as part of the universe, and the Earth when they are talking about the planet as the place where
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An astronaut is a person trained and equipped to travel in a spacecraft. They are typically crew members of a space mission.
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Space Station is a large spacecraft. It orbits around Earth. It is a home where astronauts live. The space station is also a science lab.