How a Frozen Earth Gave the Moon Its Shape
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How a Frozen Earth Gave the Moon Its Shape

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It might look like a perfect circle, but the Moon is actually wider than it is tall. Now, new calculations indicate that the Moon’s shape is a remnant of a time when Earth might’ve been covered in a single, global ice sheet.

Host: Hank Green
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Sources:
http://onlinelibrary.wiley.com/doi/10.1002/2017GL076278/full
https://www.colorado.edu/today/2018/02/06/fossilized-feature-records-moons-slow-retreat-earth
http://www.astronomy.com/magazine/bob-berman/2017/03/a-perfect-circle
https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html
https://www.space.com/19275-moon-formation.html
https://astronomy.stackexchange.com/questions/420/why-is-the-moon-receding-from-the-earth-due-to-tides-is-this-typical-for-other
https://astronomy.stackexchange.com/questions/1859/when-did-the-moon-stop
https://ntrs.nasa.gov/search.jsp?R=19990114316
http://www.bbc.co.uk/science/earth/earth_timeline/snowball_earth
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Images:
https://en.wikipedia.org/wiki/Moon#/media/File:LRO_WAC_Nearside_Mosaic.jpg
http://www.thinkstockphotos.com/image/stock-illustration-vector-cartoon-flat-globe-character/838336870
http://www.thinkstockphotos.com/image/stock-illustration-planet-and-stars-in-space/522398066
https://www.flickr.com/photos/projectapolloarchive/22318005702/
https://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=10930
http://www.thinkstockphotos.com/image/stock-photo-full-moon-in-clouds-over-sea-in-night/828004900/popup?sq=M%7CImages%20similar%20to:%20828004900%7C828004900/f=CPIHVX/s=DynamicRank
https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA17182
http://www.thinkstockphotos.com/image/stock-photo-ice-formations/77744897/popup

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