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xkcd.com

xkcd.com: A webcomic of romance and math humor.

Satellite Pollution

27 Mar 2026, 4:00 am

We're working to make sure the images are as up-to-date and accurate as possible, with a minimum number of sponsored galaxies.

Centimeter Wavelengths

25 Mar 2026, 4:00 am

Yes, the cosmic microwave background is great, but what about the earthly microwave foreground?

Inflation Timeline

23 Mar 2026, 4:00 am

Depending what corners of the internet you hang out on, 'regular' may at times awkwardly coexist with 'sexy.'

Star Formation

20 Mar 2026, 4:00 am

It's ok, I still have some nice, cool gas clouds that aren't collapsing. As long as nothing ionizes them, I can continue to enjoy their ... HEY! NO!!!

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