The conversation between human and AI assistant.
[|Human|] Find out what is the closest star to Earth.
[|AI|] 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.
[|Human|] 
Find out what is the closest star to Earth.