Question

Why solar panels used as power sources in artificial satellites?

Answer 1

Because a lot of fuel can not transported in the space. Also in our solar system sun is main source to get energy.
So solar panels are used in as power sources in artificial satellites.
Also after some time the transported fuel in satellite will get exhausted but solar energy will never get exhausted it can be renewed again and again.

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.