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These large numbers are too mind boggling for me. How many grains of sand would there happen to be in say a gallon of milk? Also, when talking about so many grains of sand, I suppose the size of the grain would have a significant change to the number. How big is a grain? Or how much variation is there from the smallest grain to the largest?AT

Just thinking about the numbers of stars and planets out there makes me think that it is impossible for there not to be other "intelligent" life forms out there......sheesh the possbilities which lie outside of our technological grasp are very exciting

Thank you for reminding us of the true nature of idiots. You are an example to us all.

Well, my math went for a different path. Not 1.28 times 10^14, but 5.1 times 10^20. Why is that? isn't it 6371000000 (mm) squared times Pi times 4???

It's not even close.So let's do some simple math. A sand grain is defined as having a range of sizes, but 1mm diameter is typical. So for simplicity let's use that size.The earth has an average radius of 6371km. This gives the earth a surface area of 1.28 times 10^14 square millimeters of surface area.There are 7 times 10^22 stars. Divide this by the surface area of the earth and we learn how deep the sand across the entire earth would have to be to equal the number of stars.The depth is 550km.So it seems reasonable to conclude that there are more stars than there are grains of sands on all the beaches.