Cheap Astronomy - Dear CA #79: Galaxies Matter!

<p class="p1">Big and ubiquitous…</p> <p class="p1"><em>Dear Cheap Astronomy – How does the galaxy rotate?<span class="Apple-converted-space"> </span></em></p> <p class="p1">There is something weird about how stars rotate in the Milky Way Galaxy – and probably in any other rotating galaxy.</p> <p class="p1"><em>Dear Cheap Astronomy – What is intergalactic dust made of?<span class="Apple-converted-space"> </span></em></p> <p class="p1">So firstly, hooray for intergalactic dust. Traditional estimates of how much known baryonic matter there is (that is, light not dark matter) never quite matched calculations of how much baryonic matter there should be given the expected amount of nucleosynthesis that should have happened within the first three minutes after the Big Bang.</p> <p class="p2"> </p> <p class="p1">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 class="p1">Just visit: <a href= "https://www.patreon.com/365DaysOfAstronomy">https://www.patreon.com/365DaysOfAstronomy</a> and donate as much as you can!</p> <p class="p1">Share the podcast with your friends and send the Patreon link to them too!<span class= "Apple-converted-space"> </span></p> <p class="p1">Every bit helps! Thank you!</p> <p class="p1">------------------------------------</p> <p class="p1">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 class="p1"><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 class="p1">Thank you! (Haven't donated? It's not too late! Just <a href="http://cosmoquest.org/Donate">click</a>!)</p> <p class="p1">------------------------------------</p> <p class="p1">The 365 Days of Astronomy Podcast is produced by the Planetary Scienc