Astronomers think there is a very large number of stars in the Universe. The observable Universe contains more than 2 trillion (10) galaxies and, overall, as many as an estimated stars (more stars than all the grains of sand on planet Earth). That is, 1,000,000,000,000,000,000,000,000 stars, which is many times more than the few hundred billion stars in the Milky Way (our galaxy). 