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Galaxies

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ck1 | 09:33 Sun 06th Oct 2013 | Science
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How do we know that there are more than 100 billion galaxies in our observable universe?
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Avatar Image Zacs-Master
Current estimates say 125 billion:
http://abcnews.go.com/Technology/t/story?id=99233&page=1&ref=https%3A%2F%2Fwww.google.co.uk%2F
11:47 Sun 06th Oct 2013
Avatar Image LazyGun
Extrapolation from sample fields and estimation.
13:19 Sun 06th Oct 2013
Avatar Image Clanad
We don't, but as LG states it's a good guess based on the observable density...
15:01 Sun 06th Oct 2013
Avatar Image ck1
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It seemed embarrassingly obvious after I'd read the answers, oh well, it was an early start today!
17:01 Sun 06th Oct 2013
Avatar Image Old_Geezer
We counted the number of stars and then divided by 5,000,000,000,000. But there may be more beyond the visible horizon.
17:16 Tue 08th Oct 2013

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