The other day my Astronomy teacher made a very valid point in his lecture. He pointed out how big the world is compared to Humans, and vast of a wide range it is. And less than .05 percent of the population get to see the whole world. He then talked about how small the earth is compared to our galaxy, after all we can only reach the moon. Then he told us to imagine how big the galaxy really was, we have barely made it off earth. And again to the human race earth is a huge thing. But then he said that there are hundreds, Thousands, Most likely Millions of other Galaxy's Making up the universe. The size of the universe could very possibly have no end, This is hard for us to understand because the world we know has an end, but the Universe probably doesn't. It is Mind boggling how Huge the Universe really is, and as a human race were are so Big ahead because of all of our accomplishments, and technology. But if you think about it, What we have done isn't even a pimple on a elephants Ass.
This also is very hard to understand but the universe is set up in the same identical structure as the cells that make up the human body. So it is extremely possible that earth and the universe are simply micro cells of a Larger "Being" we could just be a extremely small part of something truly huge. And on the same note we in our cellular structures we could have life forms similar to us. And the lifeforms on us could have even smaller lifeforms on them.
I understand this is extremely hard to wrap your mind around and truly understand, every time i do so i get goosebumps. It is just so amazing that earth to me is a Tremendously Huge thing. But on the scale of everything else it's really nothing.