How to Catch a Supernova Rerun

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On earth a sound echo lets you hear something again. Over great distances, a light echo can let you see something again, specifically an exploding star. SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at https://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Bill & Katie Scholl, Adam Brainard, Greg, Alex Hackman, Andrew Finley Brenan, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- 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? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: Armin Rest (interview): http://www.stsci.edu/institute/smo/general-information/staff/biography?user=arest http://www.pas.rochester.edu/~blackman/ast104/brahe10.html https://history.nasa.gov/SP-466/ch9.htm https://www.cfa.harvard.edu/news/2008-11 https://arxiv.org/pdf/astro-ph/0210534.pdf https://arxiv.org/pdf/0805.4607.pdf https://arxiv.org/pdf/1003.5660.pdf http://cxc.harvard.edu/cdo/snr09/pres/Rest_Armin.pdf https://arxiv.org/pdf/0810.5106.pdf http://www.spitzer.caltech.edu/images/2662-ssc2005-14d-Illustration-of-a-Light-Echo https://www.youtube.com/watch?v=nrQM0KZgQj8 https://tigerprints.clemson.edu/cgi/viewcontent.cgi?article=2640&context=all_dissertations http://www.astronomycast.com/2011/03/ep-215-light-echoes/ https://arxiv.org/pdf/1705.05405.pdf https://www.nasa.gov/content/hubble-highlights-seeing-light-echoes http://philosophy-of-cosmology.ox.ac.uk/variability-of-realm-of-fixed-stars.html http://chandra.harvard.edu/photo/2016/tycho/ ------ Images: https://en.wikipedia.org/wiki/File:Tycho_Cas_SN1572.jpg https://images.nasa.gov/details-PIA13119.html https://images.nasa.gov/details-PIA11435.html https://svs.gsfc.nasa.gov/11233 https://www.spacetelescope.org/videos/opo1742a/ http://hubblesite.org/image/4088/news_release/2017-42 https://svs.gsfc.nasa.gov/30956 https://www.spacetelescope.org/videos/astro_bn/ https://svs.gsfc.nasa.gov/11080 http://www.spitzer.caltech.edu/video-audio/762-ssc2005-14v1-The-Cry-of-Cassiopeia-A https://svs.gsfc.nasa.gov/11233


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