How Many Galaxies Are There?

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? Hosted by: Reid Reimers ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلط الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Bella Nash, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- 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