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Uploaded:2019-07-30
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Today, cosmic rays are used to understand things like supernovas, but in the early 1900s, they helped us discover brand-new subatomic particles long before the first accelerators.

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Sources:
http://www.ps.uci.edu/~yodh/cosmicraylecture/cosmicraysbriefhistory.pdf [PDF]
http://adsabs.harvard.edu/full/1937JRASC..31..381B
https://arxiv.org/abs/1808.02927
https://arxiv.org/abs/1002.1810
https://physicsworld.com/a/the-riddle-of-ultrahigh-energy-cosmic-rays/
https://www.forbes.com/sites/startswithabang/2016/10/06/scientists-catch-the-highest-energy-particles-by-making-them-go-faster-than-light/
http://lss.fnal.gov/archive/other/print-93-0553.pdf [PDF]
https://www.nature.com/articles/d41586-018-05254-2
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http://abyss.uoregon.edu/~js/glossary/cosmic_rays.html
https://www.physics.purdue.edu/images/outreach/quarknet/CosmicRays_2012.pdf [PDF]
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http://www.ung.si/public/pao/history.php
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http://hep.uchicago.edu/cdf/frisch/p363/keisler_cloud_chamber_23Apr2008.pdf [PDF]
https://link.springer.com/article/10.1007%2FBF02068933
https://timeline.web.cern.ch/source-earth-atmosphere-or-outer-space
https://cerncourier.com/domenico-pacini-and-the-origin-of-cosmic-rays/
https://www.pbs.org/wgbh/nova/einstein/lrk-hand-emc2expl.html
http://www.ep.ph.bham.ac.uk/DiscoveringParticles/detection/cosmic-rays/
http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/kaon.html
https://www.space.com/16832-cosmic-rays-discovery-100-years.html
https://home.cern/science/physics/cosmic-rays-particles-outer-space
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Images:
https://commons.wikimedia.org/wiki/File%3APacini_measurement.jpg
https://commons.wikimedia.org/wiki/File:Hessballon.jpg
https://www.istockphoto.com/photo/panorama-colorful-balloons-floating-in-the-sky-in-the-mountain-landscape-in-the-gm1096489270-294418231
https://images.nasa.gov/details-GSFC_20171208_Archive_e002182.html
https://commons.wikimedia.org/wiki/File:Physicist_Studying_Alpha_Rays_GPN-2000-000381.jpg
https://svs.gsfc.nasa.gov/20186
https://svs.gsfc.nasa.gov/11209
https://en.wikipedia.org/wiki/File:Wilson_Cloud_Chamber_at_AEC%27s_Brookhaven_National_Laboratory.jpg
https://youtu.be/E9335CW2V5M
https://commons.wikimedia.org/wiki/File:PositronDiscovery.jpg
https://www.istockphoto.com/photo/pet-scan-of-the-brain-gm178066707-24722805
https://www.istockphoto.com/vector/abstract-background-of-colored-radial-lines-effects-of-acceleration-speed-motion-gm1068535618-285824755
https://commons.wikimedia.org/wiki/File:First_neutrino_observation.jpg
http://cds.cern.ch/record/39474
https://www.flickr.com/photos/departmentofenergy/13472280055/
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