Find out what is the closest star to Earth.
The closest known star to Earth is Proxima Centauri, which is 4.24 light-years away. It is part of the Alpha Centauri star system, and is also known as Alpha Centauri C.
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### Instruction:
Find out what is the closest star to Earth.

### Response:
The closest known star to Earth is Proxima Centauri, which is 4.24 light-years away. It is part of the Alpha Centauri star system, and is also known as Alpha Centauri C.