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Where did astronomers first go to try to understand Earth's origins?

To their observatories


Which country has the most satellites orbiting earth?

The United States has the most satellites orbiting Earth.


What were the US satellites?

There are over 1000 operational satellites orbiting the Earth, and probably 10,000 pieces of "space junk" also orbiting the Earth.


Why must astronomers use sateltiles and earth orbiting observations to study the heavens at x-ray wavelengths?

Electromagnetic radiation with wavelength shorter than ultraviolet -- including x-rays -- is strongly absorbed by earth's atmosphere. X-ray detectors looking into space from the surface of the earth don't see anything, because no x-rays reach the surface ... the main reason that all life on earth has not been broiled yet by E&M radiation from space.


Where do you can find satellites orbiting earth?

the termosphere


Is there gravity where satellites are at?

Yes there are enough gravitational forces to keep the satellites orbiting earth.


What are the different artificial satellites launched into orbit?

The different artificial satellites launched are Low Earth Orbiting Satellites for Remote sensing, Medium Earth Orbiting Satellites like GPS , Geo Stationary Orbiting Satellites for Communication and Molnia Satellites again for Communication. These are the different artificial Satellite orbiting the Planet Earth.


What happens to old satellites?

Old satellites orbiting near the Earth eventually fall back into the atmosphere and burn. Satellites orbiting farther away stay in orbit indefinitely.


Why use satellites and earth orbiting observatories to study the universe at x ray or gamma ray wave lengths?

Those radiations hardly reach Earth's surface, because they are absorbed by the atmosphere.


What layer of the atmosphere has artificial satellites orbiting earth in it?

exosphere


Do many atifical satelliltes orbit earth?

2465 artificial satellites orbiting the Earth


Why are moons called naturual satellites?

It is a celestial body orbiting the earth.