Wanted to unlock this mode so bad, but I couldn't get all the medals.

Also pioneered what would come to be called surround sound, though very few theaters got the setup for it installed.

Read out loud to each other instead

Holy shit dude

I think you would have to know how much nitrogen was in their native atmosphere, and the rate at which it is converted to carbon 14. You could probably make a decent ballpark guess if you had a sample of air, and knew what star they came from and how close their planet is to that star.