On the Subject of Large Balls
We had a ball kind of like this in gym class back when I was in elementary school. The only difference was that our ball was not quite planet-sized. It was called the "cage ball," and the sport that we played using it as a prop was called... drum roll please... "cage ball." The point of the game was to keep the ball afloat and not let it hit the ground, or something to that effect. Eventually it was deemed dangerous after a couple of weaker kids got injured when they were unable to support its massive weight. If I'm not mistaken, I believe that their heads were squashed. That cage ball was heavy.