I started doing the math based on some assumptions, but this guy came up with 500 quadrillion grains: https://science-atlas.com/faq/how-many-grains-of-sand-are

I started doing the math based on some assumptions, but this guy came up with 500 quadrillion grains: https://science-atlas.com/faq/how-many-grains-of-sand-are-there-on-earth/ https://science-atlas.com/faq/how-many-grains-of-sand-are-th... Which is 5x10^17 versus 10^24. Way more stars!