Men have been interested in the stars ever since they first looked up into the sky.
some of these stars may have their own planets.if that is so ,we can know that life may exist on e of them.the problem is that the nearest star is four light years away.In other words,light from it has been travelling for four years before it finally reaches us.Maybe nobody from earth will ever visit that star because it will take a rocket a hundred thousand years to reach it .