Podcaster: Steve Nerlich

This image has an empty alt attribute; its file name is CheapAstro-150x150.png

Title: Cheap Astronomy – Dear CA #79: Galaxies Matter!

Organization: Cheap Astronomy



On the grand scale of things, galaxies are on the grand scale of things.

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.

Today’s sponsor:  Big thanks to our Patreon supporters this month: Rob Leeson, David Bowes, Ron Diehl, Brett Duane, Benett Bolek, Mary Ann, Frank Frankovic, Michael Freedman, Kim Hay, Steven Emert, Frank Tippin, Rani Bush, Jako Danar, Joseph J. Biernat, Nik Whitehead, Semyon Torfason, Michael W, Cherry Wood, Steve Nerlich, Steven Kluth, James K Wood, Katrina Ince, Phyllis Foster, Don Swartwout, Barbara Geier, Steven Jansen

Please consider sponsoring a day or two. Just click on the “Donate” button on the lower left side of this webpage, or contact us at

Please visit our Patreon page:

or you can consider to sponsor a day of our podcast :

End of podcast:

365 Days of Astronomy

The 365 Days of Astronomy Podcast is produced by Planetary Science Institute. Audio post-production by Richard Drumm. Bandwidth donated by and wizzard media. You may reproduce and distribute this audio for non-commercial purposes. 

This show is made possible thanks to the generous donations of people like you! Please consider supporting to our show on and get access to bonus content.