This app was mentioned in 16 comments, with an average of 1.88 upvotes
Planets do have conserved angular momentum. This is the reason why Kepler's laws work, and the reason why comets increase their velocity when closer to the orbitee. Here is a fun game that nicely illustrates this concept. You can set the initial angular momentum of each planet, and although you can see their speeds change, their angular momenta doesn't.
I know this is 4 months old, but I'm bored and poking through my top/controversial comments to laugh at myself. Here's the game in question I think.
https://play.google.com/store/apps/details?id=com.ChetanSurpur.Orbit&hl=en_US
Others have explained it well but theres a game that explores gravity which you might find fun and useful. Its called Orbit and its on the ios app store and google play (play store link: https://play.google.com/store/apps/details?id=com.ChetanSurpur.Orbit). Would definitely recommend for a bit of fun :)
Check out Orbit. It's a nice relaxing puzzle game where you have to launch "planets" into orbit around other fixed "planets" and avoiding getting sucked into their gravity. To pass levels, you have to get a certain number of planets to orbit. The less planets you launch, the more stars you get. Alot like angry birds, except with orbiting and very soothing classical music.
there is a neat little free game on andriod that demonstrates the movement needed to produce an orbit
https://play.google.com/store/apps/details?id=com.ChetanSurpur.Orbit&hl=en
no, i am not affiliated with this game in any way. i just started playing it last night and this thread reminded me of it, so i thought i would share because it gives a great visual representation of orbiting bodies for the layman
Suddenly I don't feel so bad about not being able to make a non-eccentric orbit in the Android orbit app.
This reminds me of the game Orbit. Have you played it? It's awesome.
Here's the link to the game on Google Play.
So is it a copy of this game?
https://play.google.com/store/apps/details?id=com.ChetanSurpur.Orbit
Looks like a more colorful version of this, I love it.
Just waiting on it to be released on Android