why do we have satellites in space

Without these things, our daily lives would look much different. Some of us couldn't watch. Some of us couldn't figure out how to
from one to another when traveling. Some of us could be by bad weather that we didn't know was coming. What are we talking about? Satellites, of course! Satellites are any objects that revolve around ( ) another in space. Some satellites are, while others are (man-made). The is an example of a satellite that orbits the Earth. We're going to, though, on the man-made satellites. satellites are machines that humans launch into, usually around the Earth. satellites can be sent to other planets, too.


For example, there are currently satellites orbiting the, the Sun, and several other planets, including Mercury, Venus, Mars, and Saturn. The Soviet Union launched the first satellite в в on October 4, 1957. The United States launched its first satellite в в about four months later. Since that time, over 2,500 satellites have been launched into space. Would you have ever guessed there are that many satellites up there in the, traveling around the Earth over and over again? What in the world do they do up there? Why do we so many of them? satellites are used for all sorts of purposes.


Satellites like the Hubble Space Telescope, the International Space Station, and the Russian Mir space station help scientists explore space in new and exciting ways. Communications satellites help us communicate with people all over the world. Weather satellites help us observe the Earth from space to help predict weather patterns. Radio and satellites beam our favorite songs, movies, and to Earth for us to. There's even a group of 27 satellites that make up the Positioning System ( ). Without these satellites, we couldn't use GPS devices to find our way while traveling.


If you're wondering how that many satellites stay in without bumping into each other, just remember that space is veryвwellв! Compared to our measurements on Earth, the size of space seems. Even though there's a lot of room in space, satellites are launched into orbits at different distances from Earth. Some may be as close as 150 miles above Earth, while others may be as far away as 20,000 miles or more. Most satellites within 500 miles of Earth or what scientists call low-Earth. These satellites have to travel very fast в about 17,000 miles per hour в to avoid being sucked back into Earth's atmosphere.


Sooner or later, though, the force of will pull all objects, including satellites, back to Earth. When satellites quit working, they become orbiting вspace junk" until pulls them back to Earth. Although at least one piece of space junk returns to Earth every day, it's rare that anyone ever notices. So no to worry that the is! These satellites are in above the Earth's. They stay above the same location on Earth. They are used for telecommunications, television transmission and for navigation.


A satellite has a Low Earth Orbit when it orbits somewhere between 300 and 800 km above the Earth's surface. These satellites only take about 90 minutes to go around the Earth. They are ideal for making observations of the Earth's resources. A polar orbit is a special LEO in which a satellite travels north-south over the Earth's poles, rather than in the more usual east-west direction. Polar orbits can be used to map the complete Earth once a day. This is needed for weather forecasts. This is a fleet of satellites which allows us to know exactly where on Earth we are.