Question about the Universe! Opinions.PLEASE ANSWER.?

Okay so at night, i always just go lay on my car,listen to some music and look at the stars and sky. Then I find out questions that I want to know the answer too. Like how far can the human eye see? look in the sky and ask yourself. How far can you see, until your vision just stops. Can you see limitless until something gets in its way? and stars, Why did God put stars here, I know in the Biblical times they were for direction....but what about now? what do they do...could they possibly be warmth for another type of being in the universe? opinions..answers. etc.