I just bought Space Engine (an astronomy program, and a
realistic virtual Universe you can explore on your computer).
(there are free versions too.)
am looking forward to checking it out.
I watched a couple youtube videos about it.
it looks spectacular.
here are links to it, and the videos:
http://spaceengine.org/
https://www.youtube.com/watch?v=c_fLvXPrvJY
https://www.youtube.com/watch?v=Htyv6m9jaNY