[Darth-Apple]

Interestingly enough, I read an article not too long ago that said that planets with significantly more mass than earth would have the problem of alien civilizations being unable to depart from the planet's surface due to the gravitational pull. More fuel would be required to overcome it, and more fuel would weigh more, causing even more fuel to be consumed. Space travel would be inhibited on those planets due to the gravitational pull.

Makes you wonder if Earth has almost the perfect mass.