View Full Version : How Many Galaxies Are There in the Universe?

2016-Nov-01, 09:50 PM
Did you hear that the Universe has 10x the number of galaxies? How did astronomers discover this, and what does it mean for the number of stars?
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2016-Nov-04, 07:01 PM
The galaxy count in the Hubble Extreme Field was discussed somewhere around here and, extrapolating, yields 175 billion galaxies. Using a little over 100 billion stars per galaxy -- those very distant ones should have fewer stars on average due to their younger age -- we can get a nice answer as to the number of stars that's easy to remember...


Assuming we are off by a factor of 30 -- the James Webb might help with this -- then we will have a nice and tidy number to work with - 6E23, making Avogadro more proud.