The total number of stars in the universe is greater than all the grains of sand on all the beaches on earth.
10,000 grains of sand in a handful of sand, which is roughly the same as:
10,000 stars visible in the sky on a clear night.
100,000,000,000 (100 billion) stars in an average galaxy.
100,000,000,000 (100 billion) galaxies in the universe.
These numbers are from Carl Sagan’s Cosmos TV Series. Here’s a clip from it:
I’ve ordered the complete DVD set from Amazon: