In today's image, we see all 218 gravitational wave events that have been confirmed since the first detection in 2015. These events occur when two massive objects, such as black holes, merge together, releasing strong gravitational waves.
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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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