The Astronomical Records in… Trees?

We can learn a lot about our galaxy by looking to the stars, but we can also reveal a lot about our cosmic history from... Dead trees? SciShow has a spinoff podcast! It s called SciShow Tangents. Check it out at http://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: Silas Emrys, Jb Taishoff, Bd_Tmprd, Harrison Mills, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Sam Buck, Christopher R Boucher, Eric Jensen, Lehel Kovacs, Adam Brainard, Greg, Ash, Sam Lutfi, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, charles george, Alex Hackman, Chris Peters, Kevin Bealer ---------- 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: https://www.radioactivity.eu.com/site/pages/RadioCarbon.htm https://www.cambridge.org/core/journals/radiocarbon/article/intcal20-northern-hemisphere-radiocarbon-age-calibration-curve-055-cal-kbp/83257B63DC3AF9CFA6243F59D7503EFF https://www.dateringsmetoder.dk/wp-content/uploads/2018/06/A-signature-of-cosmic-ray-increase-in-AD774.pdf https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2014GL059874 https://arxiv.org/pdf/1212.0490.pdf https://doi.org/10.1017/S1473550420000348 https://www.eurekalert.org/pub_releases/2020-11/uoca-trm111120.php https://pwg.gsfc.nasa.gov/polar/EPO/auroral_poster/aurora_all.pdf