There are far more stars in the universe than there are grains of sand on the entire earth! Just think how much sand there is on earth... a fuckload!
"What is the total number of galaxies in the universe? Sagan assumed 100 billion. Is that still valid? Recently the Hubble Space Telescope (HST) surveyed, to the faintest levels yet detected, a small area of sky. Extrapolating from the number of galaxies detected by HST to that expected over the whole sky, I calculate 130 billion galaxies, slightly larger than Sagans estimate. Then the number of stars in the universe is 400 billion x 130 billion, or about 50,000 billion billion. A billion billion. That's 1,000,000,000,000,000,000. So, grasp the concept of a billion billion, then think of 50 thousand of those. Easy!
The total number of sand grains on our Earth beach is then 600 billion billion. But wait!, I hear some of you remarking about sand dunes and sand below the low tide mark. To placate you worriers I'm happy to increase my initial estimate by a factor of 3. That gives me a grand total of about 2000 billion billion grains of sand on Earth.
The stars win!"
the above quote is from this fascinating link:
http://astronomy.swin.edu.au/~gmackie/billions.html