In today's image, we see an illustration showing the area around colliding black holes. This is meant to illustrate the collision detected earlier this year of two black holes - A collision which occurred a billion years ago, but is just being detected as the gravitational waves finally reach Earth.

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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.

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