Why do Muslims pray towards Mecca, if their prayers would just fly off the face of the Earth?

Since prayers aren't affected by gravity, if someone was on the other side of the Earth and prayed towards Mecca, wouldn't their prayer just fly off the Earth? Why wasn't anyone aware of this? Shouldn't they just pray straight into the ground? It wouldn't stick to the curves of the spherical earth like a plane, cuz prayers aren't, you know, real.