A satellite is an object that moves around a larger object. Earth is a satellite
because it moves around the sun. The moon is a satellite because it moves
around Earth. Earth and the moon are called "natural" satellites.
But usually when someone says "satellite," they are talking about a "manmade"
satellite. Man-made satellites are machines made by people. These
machines are launched into space and orbit Earth or another body in space.
There are thousands of man-made satellites. Some take pictures of our planet.
Some take pictures of other planets, the sun and other objects. These pictures
help scientists learn about Earth, the solar system and the universe. Other
satellites send TV signals and phone calls around the world.