How many man-made satellites are currently orbiting the Earth?

Well, 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 answer to our question is millions!

This includes actual spacecraft, and any man-made debris that has been made during the past 30 years of space exploration. People call this debris "space junk". "Space junk" orbits at a speed of roughly 7.5 kilometers/second.

That is close to 17,000 miles/hour! Think of the damage even a small speck of paint could do to the space shuttle if impact occurred at such high speeds! Another definition of satellite is a manufactured vehicle intended to orbit the Earth.

This definition makes our count much less because it includes only spacecraft and not debris that orbits the Earth. The Goddard Space Flight Center's lists 2,271 sate llites currently in orbit. Russia has the most satellites currently in orbit, with 1,324 satellites, followed by the U.S. with 658.

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Yahoo!'s Space > Satellites category offers a full payload of web sites with information about man-made orbiting machines, how they work, what they do, and where in the sky to look for them. The Satellite Encyclopedia offers a sampling of free information or a fee-based subscription service for detailed and up-to-date satellite data. (If you have an interest, you might want to pay for the subscription service in hopes of getting an absolutely precise answer.) We decided to look elsewhere by searching specifically for "number of manmade satellites."

One result, Satellites as a System, noted that there are "an estimated 2200 tons of manmade junk in the ... more.

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