Atoms in a grain of sand

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atoms in a grain of sand

Quote by James Joyce: “What must it be, then, to bear the manifold tor...”

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Published 03.01.2019

Are There More Grains of Sand Than Stars?

Started by Eman7 Board Chemistry. Started by Indranil Board Chemistry.

Craig’s Questions – Sand and Atoms

This question comes from Sheldon Grimshaw. Is this possible? As we learned in a previous video, there are to billion stars in the Milky Way and more than billion galaxies in the Universe — maybe as many as billion. If you multiply stars by galaxies, at the low end, you get 10 billion billion stars, or 10 sextillion stars in the Universe — a 1 followed by 22 zeros. These are mind bogglingly huge numbers.

The First question came about following a conversation with someone who is studying maths. He Andy casually dropped the following phrase into the conversation about numbers, as a statement meant to inspire wonder. The statement did more than just that for me though, it raised my curiosity and I felt compelled to sit down and work it out for myself. Would it be as tall as me if they were still in their cases? How wide would it be if we staked them to only my height 6 ft? At first these types of statements or questions seem impossible to answer and if anyone delivered an answer confidently enough one way or another, you might just be inclined to believe them and move on with your day.

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. My estimation with this: bilions of galaxies bilions of stars per galaxy. If a grain is a fraction of mg, 1 g of grain has truly more atoms than stars in the universe.

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