A space station
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It is a geostationary operational environmental satellite, though I'm not sure what is does.
Gamma rays
a weather satellite and it rotates around the Earth at the same rate and in the same direction that Earth revolves so it is always fixed over the same location.
polar satallite
Orbits within the atmosphere are not stable due to atmospheric friction. Friction slows (and heats) the satellite, dropping its orbit still lower (where there's more friction, therefore more slowing and heating). Eventually the satellite burns up. This is essentially what happened to Skylab and more recently to Mir.