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submitted 13 hours ago* (last edited 7 hours ago) by xkcdbot@lemmy.world to c/xkcd@lemmy.world

Title text:

Frankly, given their extreme gravitational fields and general instability, even 12-inch globes should probably be banned.

Transcript:

[A standard globe of the Earth is shown. It stands on a typical stand which holds it by two arms at the poles, so it can turn around like the Earth does. The Earth is turned so it shows Australia at the bottom and most of Asia, including the entire India to the left. Only the very tip of Alaska can bee seen of the Americas. Above the globe there is a double arrow that goes to two small lines that align with the edges of the globe (indicating the diameter). The arrow has been split in the middle and two lines of text is written in the gab. Above this text there is another line of text.]
Remember:
4 inches minimum

[Beneath the globe there are two small drawings. The left shows the Earth and to the left of the Earth there is a double arrow ending at two lines that indicated the diameter of the Earth going from top to bottom. The distance of this is written in inches to the left. From the Earth an arrow points to another drawing, this time the typical depiction of a black hole, with the "hat" shape. A warning sign is shown a the top right of the black hole with an exclamation mark inside.]
7/10"

[Caption Below the Panel:] The Earth's Schwarzschild radius is about 0.35 inches, which is why safety regulations require desktop globes to be at least 4 inches in diameter.

Source: https://xkcd.com/3086/

explainxkcd for #3086

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[-] tiredofsametab@fedia.io 56 points 9 hours ago

9mm for those wanting sane units.

[-] 01189998819991197253@infosec.pub 12 points 6 hours ago

That's "American" for a round used in a personal protection weapon. So, who is sane now?

[-] SCmSTR 12 points 9 hours ago

Pfft. There's nothing sane here.

[-] pastermil@sh.itjust.works 6 points 9 hours ago

There's also the fact that people might not be able to use it if it's too small.

[-] SaharaMaleikuhm@feddit.org 7 points 4 hours ago

4" is a respectable size, okay? It's nothing to scoff at.

[-] DragonTypeWyvern@midwest.social 3 points 2 hours ago

It's all about your spin game anyways

[-] smokinliver@sopuli.xyz 3 points 6 hours ago

Maybe its less about the size and more about the technique?

[-] abfarid@startrek.website 10 points 10 hours ago

Shouldn't 7/10" actually be 7/20"?

[-] vivendi@programming.dev 13 points 6 hours ago

What in the motherfuck are those numbers

What the fuck is wrong with your units

[-] EmptySlime 11 points 8 hours ago

Notice how the lines the 7/10" is attached to go from one side of the miniature globe to the other? This indicates that measurement is meant to be a diameter. Looking back at the paragraph before he talks about 0.35" being Earth's Schwarzschild Radius. Radius is half of diameter so doubling that radius you get 0.7 or 7/10" across at which the Earth would become a black hole.

That's what that mini diagram is showing.

[-] Gieselbrecht@feddit.org 17 points 10 hours ago

The same question is in the discussion section in ExplainXKCD, so I can confidently use the reply given there: No, 7/20" is the radius, but 7/10" is correct for the diameter.

[-] abfarid@startrek.website 2 points 6 hours ago

Oh right, didn't pay enough attention. But it was the first thing I saw in the morning.

this post was submitted on 08 May 2025
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