How Many Galaxies Are There?

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We’ve been trying to count the galaxies in the universe since the mid ’90s, but our estimates change as our tools improve. So what does our current estimate really mean?

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Hosted by: Reid Reimers
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Sources:

https://arxiv.org/pdf/1607.03909v2.pdf
https://www.nasa.gov/feature/goddard/2016/hubble-reveals-observable-universe-contains-10-times-more-galaxies-than-previously-thought
https://www.theatlantic.com/science/archive/2016/10/so-many-galaxies/504185/
https://phys.org/news/2017-01-universe-trillion-galaxies.html
https://gizmodo.com/we-were-very-wrong-about-the-number-of-galaxies-in-the-1787750693
https://www.spacetelescope.org/news/heic1620/ [includes PR videos]
https://www.scientificamerican.com/article/universe-has-10-times-more-galaxies-than-researchers-thought/
https://www.nature.com/news/hubble-telescope-reveals-deepest-view-of-the-universe-yet-1.14489
https://www.nature.com/news/universe-has-ten-times-more-galaxies-than-researchers-thought-1.20809
http://www.skyandtelescope.com/astronomy-news/universe-2-trillion-galaxies/
https://www.smithsonianmag.com/smart-news/there-are-10-times-many-galaxies-previously-thought-180960796/
http://www.slate.com/blogs/bad_astronomy/2016/10/14/there_are_two_trillion_galaxies_in_the_universe.html

http://hubblesite.org/image/385/news_release/1996-01

Images:

https://www.spacetelescope.org/images/heic0814a/
https://www.spacetelescope.org/images/opo1724a/
https://commons.wikimedia.org/wiki/File:HubbleDeepField.800px.jpg
https://commons.wikimedia.org/wiki/File:Hubble_ultra_deep_field_high_rez_edit1.jpg
https://en.wikipedia.org/wiki/File:James_Webb_Space_Telescope_2009_top.jpg
https://www.spacetelescope.org/images/heic0910i/
https://www.spacetelescope.org/images/heic1215b/
https://www.spacetelescope.org/images/heic1414a/
https://www.spacetelescope.org/images/heic0911b/
https://www.nasa.gov/mission_pages/hubble/science/hst_img_20080520.html

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