Trying to think of the immensity of it puts all my problems into perspective for me. But I also believe knowing we are only specks in the grand scheme of things should bring us closer to each other. We are all made of the same matter. The same star dust. If we zoom all the way back, and therefore, back in time, to the big bang, the beginning, there was nothing but dust, and we are all made of the stuff, at one point that was all there was. So there is no excuse to treat each other badly.
(Love the soundtrack. In case you're wondering it's Promontory, also used in Last of the Mohicans, one of my favourite films.)
Another site to try to understand the Scale of the universe.