Yes, it is estimated that there are indeed more galaxies in the universe than all the grains of sand on Earth. The exact number of galaxies in the observable universe is difficult to determine precisely, but current estimates suggest that there are around 100 billion to 200 billion galaxies.
To put this into perspective, consider the vastness of the universe. Each galaxy can contain billions to trillions of stars, and many of these stars have their own planetary systems. The sheer number of galaxies, each with their own stars and potentially habitable planets, is staggering.
On the other hand, estimating the number of grains of sand on Earth is also challenging due to the wide range of environments and different types of sand. However, even with conservative estimates, the number of grains of sand on Earth is estimated to be in the order of magnitude of 10 quintillion (10^19).
Therefore, the number of galaxies in the universe significantly exceeds the number of grains of sand on Earth. This comparison demonstrates the immense scale of the cosmos and highlights the vastness and diversity of galaxies within it.