Hubble telescope: wallpaper from our galaxy and beyond
I met someone the other day who had not seen pictures of the galaxies we can see (so far) with our telescopes. Go look, even if you have seen them. Where we live is actually very BIG and the piece of it we're most concerned with is so small. Some days it helps to have the perspective. I'm going to put a nebula on my desktop to remind me, because I can.