Question

which is the star nearest to us

Answer 1

The Sun is the closest star to Earth, about 93 million miles away. 

Answer 2

$\purple{{Alpha\:centauri\:A\:and\:B}}$

Outside of our Sun, our system's nearest neighbor is Alpha Centauri. This isn't a single star, it's actually a triple-star system — three stars bound together by gravity. Alpha Centauri A and B are two bright, closely orbiting stars with a distant, dim companion named Proxima Centauri.