He said...
Things that are launched into the air will return back down to the ground.
Why? Because gravity, that's why.
Whether it's someone jumping up as high as they possibly can, a football being thrown over an open field, or planes flying from place to place, these things can't remain off the ground forever;
Eventually, due to the force of gravity, they will come back down.
Hence, this phrase looks like it came from a basic observation of what gravity does to people or objects.
Things that are launched into the air will return back down to the ground.
Why? Because gravity, that's why.
Whether it's someone jumping up as high as they possibly can, a football being thrown over an open field, or planes flying from place to place, these things can't remain off the ground forever;
Eventually, due to the force of gravity, they will come back down.
Hence, this phrase looks like it came from a basic observation of what gravity does to people or objects.
