Cheap Astronomy - Dear CA #79: Galaxies Matter!

Big and ubiquitous… Dear Cheap Astronomy – How does the galaxy rotate?  There is something weird about how stars rotate in the Milky Way Galaxy – and probably in any other rotating galaxy. Dear Cheap Astronomy – What is intergalactic dust made of?  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.   We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.  Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can! Share the podcast with your friends and send the Patreon link to them too!  Every bit helps! Thank you! ------------------------------------ Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness! http://cosmoquest.org/Donate This show is made possible through your donations.  Thank you! (Haven't donated? It's not too late! Just click!) ------------------------------------ The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu Visit us on the web at 365DaysOfAstronomy.org or email us at [email protected].