I remember when I was a kid, I used to lay down on the grass on a hot summer day and look up into the clear blue skies. After a while i would get very nervous and worried that gravity would stop working and I would start floating into the sky. I looked nearby for a tree or a pole that i could grasp onto in case i started floating. The only thing that calmed me down is when i saw some nice puffy clouds passing by. If i couldn't grab onto anything, at least i could make my way onto one of those clouds and it would keep me safe and I wouldn't float into space.