... About asteroids hitting Earth. ... Did Tesla extract free energy from thin air? ... Where do gravity of Earth and Sun balance? ... The whole weather process is driven by the heat of the Sun, and by the collection of processes by which the Earth returns heat to space. ... Since the Sun has provided heat energy for the evaporation, water vapor acts a bit like extra heat given to the air; when the water is removed as rain, air gets that heat back and is warmed, which is what drives thunderstorms. ...