One of the greatest discoveries in science has to be the size of the universe. When we look up in the night sky, not only are we seeing stars that are immensely far away, but extremely old. The deeper we look into the universe, the further back in time we are seeing. The universe is so grand that some of the stars we see in the sky have long died out and their light is only reaching us now. Check out this website for a glimpse into the size and depth of outer space. Each one of those dots is a star that may contain planets which may contain life. Welcome to the rabbit hole.