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Schwarzschild Radius Pin

$10.00

The diameter of this pin is the same as a black hole with the mass of Earth.

If you compress any amount of mass, it becomes denser. If you compress it enough, it will become so dense that light can no longer escape it—this size is the object’s Schwarzschild radius. An object that is compressed smaller than this radius is a black hole.

If you compressed all of the mass of Earth into the diameter of this pin, it would be so incredibly dense that you would not even be able to see it.

Every object has a Schwarzschild radius proportional to its density: the Sun's is 3km, Jupiter’s is 2.62m, and a hamburger’s is smaller than a single atom. Karl Schwarzschild derived this property in 1915 using Einstein’s recent field equations.

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Schwarzschild Radius Pin

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CUSTOMER REVIEWS
CUSTOMER REVIEWS

Customer Reviews

Based on 12 reviews
83%
(10)
17%
(2)
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M
M.C. (Virginia, United States)

I bought this for my son‘s birthday, and he loved it!

D
D.

Dolpe rated this 5 stars on Etsy

G
G.

This pin is genius and definitely a great conversation starter! Pin comes with a metal backing and shipping is incredibly fast!

J
J.

The pins are just what I expected!!! They will be fun on shirts.

R
R.

Robin rated this 5 stars on Etsy

A
A.

I love this pin so much! Its high quality and well made. Thank you!

E
E.B.

Fun and educational!

A
A.P. (Florida, United States)
Meditative

I pinned this to the wall next to my computer desk and I can stare at it contemplatively, it’s incredible to visualize and the pin makes a neat way to remind me of how small I am in the universe

C
C.F.

My Astrophysicist friend laughed when he received it -- genuinely loved it and thought it was awesome!

J
J.P.

Joshua rated this 5 stars on Etsy

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Schwarzschild Radius Pin

Schwarzschild Radius Pin

$10.00