I am not a physicist, but I believe in Randall, and his article states that "If the asteroid has a radius of 1.75 meters, then in order to have Earth-like gravity at the surface, it would need to have a mass of about 500 million tons. This is roughly equal to the combined mass of every human on Earth." The sneezing part was more hyperbolic than literal... but not by much. randall says that you can go into orbit at sprinting speeds, so... I would love for this to be in game, and I'm fairly confident that so would your more tech-inclined fans will appreciate the source. The Venn-Diagram of people who play games, play kerbal space program and read XKCD I'm assuming is a pretty substantial set... even if only looking at NASA. Randall already has a real asteroid, maybe he should get a kerbal one too.