2023 October 06 - Edwin Hubble Discovers the Universe
Channel: APOD Podcast
Date: 2023-10-06

In today's image, we see a photographic plate of the Andromeda Galaxy marked by Edwin Hubble one hundred years ago with the identification of variable stars. This discovery led to an increase in our understanding of the size of the universe showing that Andromeda was not a nebula within our galaxy but actually another galaxy or island universe of its own. 

This YouTube channel is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: https://apod.nasa.gov/apod/ap231006.html.

I also provide lecture videos to accompany the free OpenStax Astronomy textbook (https://openstax.org/details/books/astronomy/) on another channel. They are avilable here: https://www.youtube.com/playlist?list=PLMahwAGxKuWldeQ_qaIj8c0i7qbfyfLj4 or through this channel: https://www.youtube.com/channel/UCLXFGlTeF86MsI1HqBcuqKQ

Note: All commentary is created by me and is not necessarily approved or sanctioned by APOD or NASA.