In today's image, we see a simulation showing the formation of a galaxy disk over billions of years compressed down into about 2 minutes. Galaxy evolution takes such a long time that there is no way we can see a galaxy evolve and change except through models and simulations such as the one used today.

My podcasts are available in video form through this YouTube Channel.

This Podcast is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: Astronomy Picture of the Day. You can use the archive link below the image to select the photo corresponding to the date of this podcast.

I welcome comments and suggestions about these podcasts. I can be reached here: wagnerastronomy@gmail.com

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