2020 April 26 - Edwin Hubble Discovers the Universe
Channel: APOD Podcast
Date: 2020-04-26

In today's image, we see an image of the Andromeda Galaxy from nearly 100 years ago. This image identified the presence of Cepheid variable stars in the Andromeda Galaxy which allowed for the determination of its distance. This demonstrated that the Andromeda Galaxy was actually another galaxy outside of our own and not a part of our galaxy. This has been a subject of intense debate - including the Great Debate that occurred 100 years ago today on the nature of what were then known as spiral nebulae.

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/ap200426.html.