Astronomy Cast Ep. 682: Ultra-Diffuse Galaxies & Dark Matter

<p><a href= "https://www.youtube.com/watch?v=ta9lH755xw0">https://www.youtube.com/watch?v=ta9lH755xw0</a></p> <p><strong>Streamed live on May 15, 2023.</strong></p> <p>Astronomers first noticed the strange behaviors of rotating galaxies almost 100 years ago, suggesting there’s an invisible dark matter hold them together with gravity. Or maybe we just don’t understand how gravity works at the largest scales. Observations are much better now, and astronomers have found examples of galaxies that are almost entirely made of dark matter. Does this tell us anything?</p> <p> </p> <p><strong>This video was made possible by the following Patreon members:</strong></p> <p>Burry Gowen</p> <p>Stephen Veit</p> <p>Jordan Young</p> <p>Venkatesh Chary</p> <p>Andrew Poelstra</p> <p>Brian Cagle</p> <p>David Truog</p> <p>Jeanette Wink</p> <p>Gerhard Schwarzer</p> <p>David</p> <p><strong>THANK YOU! - Fraser and Dr. Pamela</strong></p> <p> </p> <p>We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.<span class= "Apple-converted-space"> </span></p> <p>Just visit: <a href= "https://www.patreon.com/365DaysOfAstronomy">https://www.patreon.com/365DaysOfAstronomy</a> and donate as much as you can!</p> <p>Share the podcast with your friends and send the Patreon link to them too!<span class="Apple-converted-space"> </span></p> <p>Every bit helps! Thank you!</p> <p>------------------------------------</p> <p>Do go visit <a href= "http://www.redbubble.com/people/CosmoQuestX/shop">http://www.redbubble.com/people/CosmoQuestX/shop</a> for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!</p> <p><a href= "http://cosmoquest.org/Donate">http://cosmoquest.org/Donate</a> This show is made possible through your donations.<span class= "Apple-converted-space"> </span></p> <p>Thank you! (Haven't donated? It's not too late! Just <a href= "http://cosmoquest.org/Donate">click</a>!)</p> <p>------------------------------------</p> <p>The 365 Days of Astronomy Podcast is produce