What do artificial satellites do?
Weather satellites orbit the earth several hundred miles up. They measure the temperature and amount of moisture, or dampness, in the air. They send back TV pictures showing where there are clouds and storms on earth. Communications satellites pick up electrical waves from TV stations. The waves bounce back to distant places on earth. That is how you (get ~live” TV broadcasts from halfway around the world. Some communications satellites are used for sending long-distance telephone calls. Some scientific satellites measure radiations from outer space that do not get through the air to the ground. Other scientific satellites carry telescopes that send back pictures of planets and stars. These pictures are much clearer than any taken from earth. 73. What is an astronaut? A cosmonaut is a Russian space traveler. The word comes from two Greek words that mean “sailor of the universe.” An American space traveler is called an astronaut. The word means “sailor among the stars.” 74. When did man
