Look closely:
This Hubble Space Telescope
image shows 10,000 galaxies!
The astronomer Carl Sagan said something like,
“A typical galaxy has 100 billion stars, and a
typical universe has 100 billion galaxies!”
Using this, can you estimate
the total number of stars?
See the next page…
Credit: NASA, ESA, and S. Beckwith (STScI) and the HUDF Team
http://spacetelescope.org/images/heic0611b/
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