Yea cosmology is one the coolest most mindblowing scientific frontiers. The numbers are hard to wrap your mind around sometimes, but one of the fact I remember that really mind blowing is...the entire visible universe (which since the universe is about 14 billion years old, is about 14 billion light years out in every direction) was all confined to the size of an atomic nucleus, then expanded to the size of an acorn and then kept expanding to its current size (there are more details and complex crap im leavin out, but you get the idea). I kept my textbook, so I could keep readin it.