I'm always fascinated by this. Here's a few of my favorites:<p><a href="https://www.youtube.com/watch?v=udAL48P5NJU" rel="nofollow">https://www.youtube.com/watch?v=udAL48P5NJU</a><p><a href="https://www.youtube.com/watch?v=HEheh1BH34Q" rel="nofollow">https://www.youtube.com/watch?v=HEheh1BH34Q</a><p><a href="http://scaleofuniverse.com/universe-large.jpg" rel="nofollow">http://scaleofuniverse.com/universe-large.jpg</a> (large image)
Although this has been featured on HN a few times before, I hadn't realised it was put together by a couple 14 year old school kids. Well done them:<p><a href="http://abcnews.go.com/Technology/page/scale-universe-cary-michael-huang-california-high-school-15573968" rel="nofollow">http://abcnews.go.com/Technology/page/scale-universe-cary-mi...</a>
This is such a great demo. I saw this maybe a year ago and was just thinking about it the other day. Huge nebulas larger than the galaxy are completely mystifying.