Amazing FREE program for science - Celestia I found a great FREE program for anyone who teaches the Solar System and Universe. I was searching for a recipe box program last night and stumbled across a link for something called Celestia. It looked interesting so I clicked on it and then decided to download it. I have been addicted to it ever since. Celestia is a FREE program that simulates the known universe and the solar system. In this program you can explore the planets, stars, solar system and parts of the universe. It is amazingly realistic and has tons of add-ons you can download (all free) that increase the experience. It recognizes the correct time, date and corresponding position of everything in the universe. You can also speed up and slow down time to see how things orbit and watch events. Here is a great example of what the program does: http://www.youtube.com/watch?v=t706Me4viC8 And another one: http://www.youtube.com/watch?v=UUlLvGsRywU Here is a great User Guide to learn how to use it: http://en.wikibooks.org/wiki/Celestia I downloaded it from here, but you can download it from other places too. Just do a search for it. http://www.snapfiles.com/get/celestia.html http://www.shatters.net/celestia/ The funny part is that since it is created by volunteer science/computer buffs you can downloads add-ons for Star Trek, Star Wars, and Battlestar Galactica space ships. But check it out. I have only had it for a day, but I haven't had any viruses or other problems so I think it is safe. It also seems to have been around for quite a while. There is even a Wiki created for it. I really wish I would have had this for my class last year since we did a whole unit on the Solar System.