San Diego Astronomy Association (SDAA) sponsors speakers on a wide range of astronomy topics on the third Wednesday of every month at the Mission Trails Regional Park Visitors Center. The Program meeting begins at 7:00 PM. Each attendee receives one free door prize ticket. After announcements and a small amount of business, the audience is treated to the featured presentation. At the close of the meeting the door prizes are presented.  The event is open to the public. The Mission Trails Regional Park Visitors Center is at One Fr. Junipero Serra Trail, San Diego CA 92119.  Call the park at 619-668-3281 for more information or visit

Please contact Dave Wood if you have an questions, comments, or ideas for the Program Meetings.

October 21, 2020

Speaker: Mia de Los Reyes

Topic: The Loneliest Galaxies in the Universe

SDAA Speaker

Most of the matter in the universe is located in long and thin structures called "cosmic filaments" that stretch across the universe in web-like formations. However, some galaxies live in the much emptier spaces between cosmic filaments, called cosmic voids. By comparing the chemical makeup of void galaxies and filament galaxies, we can learn about how galaxies' environments shape their formation and evolution.


Zoom link to our on-line meeting starting at 7:00 PM (PST) October 21, 2020:

Register in advance for this meeting:

After registering, you will receive a confirmation email containing information about joining the meeting.

Upcoming SDAA Program Meetings
January No general meeting - annual banquet
February 19 Dr. Steven Levin (NASA JPL) - NASA's Juno at Jupiter
March 18 Dr. Nicholas Galitzki ( UCSD) - Cosmic Microwave Background at the Simons Observatory - cancelled
April 15 Mr. Paul Ericson - International Dark-Sky Association
May 20 Dr. Quinn Konopacky (UCSD) - The Intricate Dance of Star and Planet Formation
June 17 Dr. Jim Fuller (CalTech) - The Sound of Stars
July 15 Blaine Baggett - Apollo at JPL
August 19 Dr. Nicholas Galitzki ( UCSD) - Cosmic Microwave Background at the Simons Observatory
September 16Steve Hallmann - "Discovering The Darkness ... Dark Matter & Dark Energy ... An Overly Simplified Tale of How We Came To Know That Most Of The Universe Is Dark"
October 21 Mia de los Reyes - The Loneliest Galaxies in the Universe
November 18 Dr. Alex Ji - The First Stars