There is a very cool program called Universe Sandbox. It lets you mess around with the universe by adding planets, changing the size of stars, etc. You can even place silly things like bowling balls and dice. I downloaded the free demo, which includes the premium features for an hour, and basic simulation viewing as long as you want.
I must say, I’m very impressed. I opened up the Solar System simulation and placed the biggest star I could find just outside the Asteroid Belt . The gravity sucked everything into it within days(seconds in real-time). I was strangely… pleased. 😈 Anyway, It is a very cool program.
Some screen shots from Google Images:
I am extremely impressed and I plan to buy it when I have the money. Here is the link:
*Includes a Star Wars Easter egg
*Reasonably easy to use
* Graphics are simply stunning
*A bit expensive, at an asking price of about $20, or $10 on Steam
*Not always accurate, especially on higher times per second in the Solar System simulation
*Planets just get a bright impact point when hit by a smaller object, but will occasionally get bigger when hit by another planet
SCORE : 8 out of 10