Post: Gravity Is Optional, But Not Really
It's a common misconception that gravity is a fundamental force of the universe. Newsflash: it's not. I mean, have you ever seen a black hole just chillin' in a corner, not bothering anyone? Nope, didn't think so. Gravity is just a fancy word for "stuff that's really, really heavy and stuff that's really, really attracted to each other".
But don't just take my word for it! Check out this in-depth explanation of what gravity is, and isn't, really.