Anyone notice there have been more than a few of these lately?
I recently got a game called solar 2. Basically, you go around the universe sucking things up and becoming a bigger asteroid/planet/star/black hole.
It's fun, but I've lost interest in it fast. It doesn't seem like there's all that much to do.
Then there's an older one,
Osmos, where you... float around sucking up things smaller than you! this one's much more gripping, because it has clearer missions and goals.
Then there's
universe sandbox, which I'm happy to see doing well on steam. A year or two ago the guy was selling it for however much you wanted to pay for it (1 cent to infinity). I was happily surprised to see it on the front page of steam. I've messed around on this for hours.
Aaaand then there's "relativity", which is awesome (although I've only played the demo). This game (I'm pretty sure) uses solutions to relativistic physics in 2D.
http://www.youtube.com/watch?v=9MY-PSMGTws
I kinda like this trend - space/gravity based simulation-type games are really cool. Are there any of these that I'm missing out on?
[edit]
although... Relativity and Solar 2 aren't totally simulations, because the orbits of planets are constrained.

Why does blue text appear every time you are near?