The Impossible Element Hiding in the Sun

Not all of the naturally occurring elements were discovered here on Earth. Helium was discovered by examining sunlight, and that same technique is now teaching us about the composition of distant galaxies.

Hosted by: Reid Reimers

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Sources:

https://www.worldscientific.com/worldscibooks/10.1142/p371
https://royalsocietypublishing.org/doi/10.1098/rspl.1895.0006
https://www.chemistryworld.com/features/150-years-of-helium/3009232.article
https://www.ucalgary.ca/news/utoday/april28-2010/earth

Images:

https://en.wikipedia.org/wiki/File:DIMendeleevCab.jpg
https://en.wikipedia.org/wiki/File:Dmitry_Mendeleyev_Osnovy_Khimii_1869-1871_first_periodic_table.jpg
https://commons.wikimedia.org/wiki/File:Sz%C3%ADnsz%C3%B3r%C3%B3d%C3%A1s_prizm%C3%A1n1.jpg
https://commons.wikimedia.org/wiki/File:Fraunhofer_lines.svg
https://commons.wikimedia.org/wiki/File:Sodium_spectrum_visible.png
http://www.thinkstockphotos.com/search/#/f=PICHVX/M||825810902
https://en.wikipedia.org/wiki/File:Solar_eclipse_1999_4_NR.jpg
https://commons.wikimedia.org/wiki/File:Helium_spectrum_visible.png
https://svs.gsfc.nasa.gov/12850
http://www.thinkstockphotos.com/image/stock-illustration-collection-of-vector-royal-crowns-for/958687442

Thumbnail: https://svs.gsfc.nasa.gov/11721