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submitted 2 weeks ago by xkcdbot@lemmy.world to c/xkcd@lemmy.world

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Title text:

I'm trying to buy a gravitational lens for my camera, but I can't tell if the manufacturers are listing comoving focal length or proper focal length.

Transcript:

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[-] marcos@lemmy.world 19 points 2 weeks ago

Do not drink the liquid mirror!

I repeat. Do. Not. Drink. The liquid mirror!

[-] tacosanonymous@mander.xyz 3 points 2 weeks ago

But I’m so thirsty meow.

[-] Hamartiogonic@sopuli.xyz 3 points 2 weeks ago

Forbidden juice…

[-] elvith@feddit.org 2 points 2 weeks ago

Instructions unclear, drinking straw stuck in telescope.

[-] TheHotze@lemmy.world 1 points 2 weeks ago

But its shiny, and smells interesting.

this post was submitted on 17 Dec 2025

176 points (100.0% liked)

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