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How Do We Know the Age of the Universe?

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What kinds of tools do astronomers use to calculate the age of the universe, and how can they determine the speed of its expansion?

Hosted by: Caitlin Hofmeister
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Sources:

https://www.nasa.gov/mission_pages/hubble/science/xdf.html
https://www.wolframalpha.com/input/?i=atomic+spectrum+of+hydrogen
https://www.nobelprize.org/nobel_prizes/physics/laureates/2011/advanced-physicsprize2011.pdf http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1992ARA%26A..30..359B&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1958ApJ…127..513S&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
https://www.cfa.harvard.edu/~dfabricant/huchra/hubble/
http://www.annualreviews.org/doi/pdf/10.1146/annurev.aa.33.090195.002545

Images:

http://www.thinkstockphotos.com/image/stock-photo-rustic-southern-american-comfort-food-chicken/585506034
https://en.wikipedia.org/wiki/File:Dark_Energy.jpg
https://www.nasa.gov/mission_pages/hubble/science/hst_img_20080520.html
https://en.wikipedia.org/wiki/File:Asymmetric_Ashes_(artist%27s_impression).jpg
https://commons.wikimedia.org/wiki/File:Ilc_9yr_moll4096.png
http://www.esa.int/spaceinimages/Images/2016/06/A_mysterious_hermit

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