How Many Stars Are There?

Counting stars from the shore of the cosmic ocean…
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How many stars are there in the universe? Are there more stars out there than grains of sand on Earth? Thanks to advanced space telescopes, we’ve been able to peer farther into deep time and the distant universe than we ever thought possible, and we might finally be able to answer these mind-boggling questions.

Every star visible from Earth (naked eye): http://en.wikipedia.org/wiki/Bright_Star_Catalogue
Number of stars in the universe (estimated): http://www.universetoday.com/102630/how-many-stars-are-there-in-the-universe/
Hubble gigapixel image of Andromeda: http://www.spacetelescope.org/images/heic1502a/
Hubble eXtreme Deep Field: http://xdf.ucolick.org/
How big is the sky? http://www.badastronomy.com/bitesize/bigsky.html
How much sand is there on Earth? http://www.hawaii.edu/suremath/jsand.html
What would the cosmic sandbox look like? https://what-if.xkcd.com/83/

Carl Sagan’s Cosmos: “The Shore of the Cosmic Ocean”: https://www.youtube.com/watch?v=Pa1ImgOcOPM


Have an idea for an episode or an amazing science question you want answered? Leave a comment below!
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It’s Okay To Be Smart is written and hosted by Joe Hanson, Ph.D.
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Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen Inc.
Kate Eads - Associate Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Katie Graham - Director of Photography
John Knudsen - Gaffer
Dalton Allen - Post-Production Intern

Theme music:
“Ouroboros” by Kevin MacLeod

Other music via APM

Stock images from Shutterstock

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Last week’s video:
What Color IsThe Universe https://www.youtube.com/watch?v=ibVofIHq71s

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Why Does February Have 28 Days? https://www.youtube.com/watch?v=AgKaHTh-_Gs
Why Vaccines Work https://www.youtube.com/watch?v=3aNhzLUL2ys
Why Are Some People Left-Handed? https://www.youtube.com/watch?v=NPvMUpcxPSA
Where Doesthe Smell of Rain Come From? https://www.youtube.com/watch?v=lGcE5x8s0B8