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How many satellites orbit Earth?

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Earth has a variety of satellites as explained below. (See related links for sources.)

Natural Satellites:

Earth has one natural satellite. The Moon.

Quasi Satellites:

Quasi-satellites accompany Earth as it orbits the Sun but while located near Earth and affected by Earth's gravitational pull, they actually orbit the Sun and not earth. Their orbits are unstable they appear and disappear over thousands of years. There are at least five such quasi-satellites, including Cruithne which was discovered in 1986 and has been called "Earth's second moon" though it is only 5 kilometers in size and does not actually orbit Earth. The designation of quasi-satellites is ambiguous and there may be more that have not been observed, so there is no fixed number.

In 2010 it was discovered that Earth posses at least one Trojan asteroid that precedes Earth as it orbits the Sun. This asteroid exists in a stable gravitational fixed point known as a Lagrangian point. Trojan satellites had been previously seen associated with other planets in the solar system. It is expected that more will be discovered.

Artificial Satellites:

As of April, 2013, there are 3707 artificial satellites in orbit around Earth.

Debris:

This does not include various sorts of debris which remain in orbit, intentionally or not, from previous launches. There are at least 13 144 such objects, not including an uncountable number of small pieces that are strewn about as a result of intentionally discarded trash or accidents or collisions.
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How does a satellite orbit the earth?

    Tie a washer onto a piece of string and swing it in a circle over your head. Now in the case of the satellite, Earth is like your hand, gravity is like the string

How many communications satellites orbit earth today?

That depends on how you define satellite, One definition of the word satellite is a body that orbits a larger body. If you take this as the definition of satellite then the a

How many GPS satellites orbit earth?

24 active with 6 spares.

What do earth orbiting satellites run on?

My guess would be solar power from the sun. Indeed, virtually all satellites are primarily powered by solar panels turning sunlight to electricity. However, a small minority

How many satellites are orbiting the earth now?

One natural and thousands of artificial ones. Do we count the  pieces of satellites, and the expended rocket motors that launched  them, and the things that fell off of them

How satellite orbits around Earth?

The satellite is pulled towards the Earth by the force of gravity, but it also has it own high velocity in its orbit. As it accelerates downwards towards the centre of the Ear