Are Sharks Really Older Than the North Star?

If you've spent enough time on the internet, you may have stumbled upon the fact that sharks are older than Polaris, aka the North Star. But are they really? It turns out the truth is a little more complicated.

Hosted by: Reid Reimer (he/him)

Credit correction:
Writer: James M. Gaines
Editor: JD Voyek
Fact Check: Heather Hess
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Sources:
https://www.nhm.ac.uk/discover/shark-evolution-a-450-million-year-timeline.html
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6790773/
https://agro.icm.edu.pl/agro/element/bwmeta1.element.agro-article-3d071941-22e9-48bd-a930-14bba1296be0
https://iopscience.iop.org/article/10.3847/2515-5172/aad2d0
https://iopscience.iop.org/article/10.3847/1538-4357/aaa3f9/meta
https://iopscience.iop.org/article/10.3847/1538-4357/aad410
https://www.aanda.org/articles/aa/pdf/2019/03/aa34211-18.pdf
https://www.nhm.ac.uk/discover/shark-evolution-a-450-million-year-timeline.html
https://www.aanda.org/articles/aa/pdf/2019/03/aa34703-18.pdf
https://www.jstage.jst.go.jp/article/starsandgalaxies/3/0/3_4/_pdf/-char/ja


Image Sources:
https://www.gettyimages.com/detail/video/social-media-mobile-phone-scrolling-the-media-newspaper-stock-footage/1464507513?adppopup=true
https://commons.wikimedia.org/wiki/File:Greenland_shark_profile.jpg
https://en.m.wikipedia.org/wiki/File:Phoebodus_teeth.jpg
https://rs.figshare.com/articles/journal_contribution/Supplementary_material_from_The_early_elasmobranch_i_Phoebodus_i_phylogenetic_relationships_ecomorphology_and_a_new_time-scale_for_shark_evolution/9885062?backTo=/collections/Supplementary_material_from_The_early_elasmobranch_i_Phoebodus_i_phylogenetic_relationships_ecomorphology_and_a_new_time-scale_for_shark_evolution_/4673138
https://commons.wikimedia.org/wiki/File:Polaris_-_17_April_2017.jpg
https://commons.wikimedia.org/wiki/File:Polaris_alpha_ursae_minoris.jpg
https://www.gettyimages.com/detail/video/beautiful-night-star-trails-spin-around-north-star-over-stock-footage/496038353?adppopup=true
https://en.wikipedia.org/wiki/Polaris#/media/File:Polaris_alpha_ursae_minoris.jpg
https://en.wikipedia.org/wiki/Polaris#/media/File:Polaris_system.jpg\
https://commons.wikimedia.org/wiki/File:Polaris_DSS.png
https://www.gettyimages.com/detail/video/people-on-shore-looking-through-telescope-stock-footage/857792980?adppopup=true
https://en.wikipedia.org/wiki/Gaia_(spacecraft)#/media/File:Maquette_de_Gaia_salon_du_Bourget_2013_DSC_0191.JPG
https://www.gettyimages.com/detail/photo/orion-and-canis-minor-constellations-and-sirius-royalty-free-image/1182095141?phrase=sirius%2BA
https://www.gettyimages.com/detail/photo/vernier-calliper-and-ruler-royalty-free-image/512523456?adppopup=true
https://www.gettyimages.com/detail/photo/the-guiding-star-royalty-free-image/1439505344?adppopup=true
https://www.gettyimages.com/detail/video/red-hearts-rising-up-falling-love-sweet-romantic-loop-stock-footage/1277723997?adppopup=true
https://www.gettyimages.com/detail/video/deep-ocean-and-huge-group-of-sharks-loop-3d-stock-footage/1011437534?adppopup=true