How 19th Century Lighthouses Power Advanced Space Drives

The technology we use for space exploration gets more advanced all the time, but some of our most ambitious programs actually rely on optics invented in the 19th century for lighthouses. Hosted By: Hank Green SciShow is on TikTok! Check us out at https://www.tiktok.com/@scishow ---------- Support SciShow Space by becoming a patron on Patreon: https://www.patreon.com/SciShowSpace ---------- Huge thanks go to the following Patreon supporter for helping us keep SciShow Space free for everyone forever: GrowingViolet, Jason A Saslow! ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: http://www.scishowtangents.org Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Instagram: http://instagram.com/thescishow ---------- Sources: https://climate.nasa.gov/news/991/generating-electricity-from-20-suns/ https://solarsystem.nasa.gov/missions/deep-space-1/in-depth/ https://www.space.com/43044-deep-space-1.html https://directory.eoportal.org/web/eoportal/satellite-missions/pag-filter/-/article/deep-space-1 https://www.nasa.gov/mission_pages/tdm/sep/index.html https://spinoff.nasa.gov/Spinoff2012/ee_6.html https://www.jpl.nasa.gov/nmp/ds1/tech/scarlet.html https://www.qrg.northwestern.edu/projects/vss/docs/propulsion/1-what-is-the-difference.html https://www.britannica.com/biography/Augustin-Jean-Fresnel https://uslhs.org/fresnel-lens http://www.modulatedlight.org/optical_comms/fresnel_lens_comparison.html Images: https://www.istockphoto.com/photo/lighthouse-gm115630391-4271509 https://commons.wikimedia.org/wiki/File:Deep_Space_1_clean_(PIA04242).png https://commons.wikimedia.org/wiki/File:Animation_of_Deep_Space_1_trajectory.gif https://commons.wikimedia.org/wiki/File:Ion_Engine_Being_Installed_in_High_Vacuum_Tank_-_GPN-2000-000597.jpg https://www.istockphoto.com/photo/view-of-the-planet-saturn-with-rings-cassini-probe-in-exploration-around-the-planet-gm1169625832-323404815 https://www.jpl.nasa.gov/news/press_kits/ds1launch.pdf https://commons.wikimedia.org/wiki/File:Ion_engine.svg https://commons.wikimedia.org/wiki/File:Ion_Engine_Test_Firing_-_GPN-2000-000482.jpg https://commons.wikimedia.org/wiki/File:NASA_NEXT_Ion_thruster.712983main_NEXT_LDT_Thrusterhi-res_full.jpg https://commons.wikimedia.org/wiki/File:Augustin_Fresnel.jpg https://www.shutterstock.com/image-vector/convex-concave-lens-vector-illustration-diagrams-1663543309 https://commons.wikimedia.org/wiki/File:Fresnel_lens.svg https://commons.wikimedia.org/wiki/File:Fresnel_lighthouse_lens_diagram.png https://commons.wikimedia.org/wiki/File:Collimator2.svg https://www.istockphoto.com/photo/lighthouse-and-ships-in-the-night-gm181073404-25372414 https://commons.wikimedia.org/wiki/File:Magnifying-fresnel-lens.jpg https://commons.wikimedia.org/wiki/File:Black_light_test_of_Dawns_solar_cells.jpg https://www.jpl.nasa.gov/nmp/ds1/tech/scarlet.html https://www.jpl.nasa.gov/images/pia04496-artists-concept-of-deep-space-1-encounter-with-comet-borrelly https://www.istockphoto.com/photo/row-of-solar-panels-on-roof-at-home-gm1069245432-286023882 https://commons.wikimedia.org/wiki/File:Amonix7700.jpg https://commons.wikimedia.org/wiki/File:AEHF_1.jpg https://commons.wikimedia.org/wiki/File:Lunar_Orbital_Platform-Gateway.jpg