The brightest and closest star is of course our sun which is 1 AU(150 million Km or 93 million Miles) away from Earth or 8 light minutes. The closest star after that is Proxima Centauri which is 4...
I assume that you meant to ask "How many stars are 1 light year from the earth?"
The answer is none.
The closest star to us is Alpha Centauri which is 4 light years away.
Unless you count our...