Which is greater, the number of grains of sand on Earth or the number of stars in the sky? It isn’t even close. If you calculated how many grains of sand are in a teaspoon, and multiply it times all the beaches and deserts on earth you get seven quintillion, five hundred quadrillion grains. The number of stars is 70 thousand million, million, million of them. Stars win, but weirdly there are just as many molecules in ten droplets of water as there are stars.