Question

Why are solar cell panels used in artificial satellites/space stations?

Answer 1

Because there is no source of energy in space rather than solar energy.

Answer 2

in order to provide energy
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solar cell panels used in artificial satellites/space stations because the satellites require energy to revolve or to send the information to earth and there is no other way to give energy to these  artificial satellites from earth 

solar energy can easily be used by these satellites via the sun as the sun will be in its place all the time.