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Tungsten Black Hole Model

$40.00

WE LAUNCHED THIS PRODUCT ON KICKSTARTER AND IT WAS FUNDED OVER 200%


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.

This tungsten sphere has been engineered to have exactly the same radius as the Schwarzschild radius of Earth. If you compressed all of the mass of Earth into the volume of this tiny sphere, it would be so incredibly dense that you would not even be able to see it.

This sphere is a great aid for comprehending the scale of black holes and their extreme density. Made of tungsten, one of the densest elements in the universe, to help illustrate the high density of such an object. Also makes a great tungsten (W, 74) sample for element collectors.

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.

Free "Earth as a black hole" pin with purchase, also pictured.

*Since it is one of the hardest materials in the universe, tungsten is extremely difficult to shape. Please allow for some minor imperfections*

Derivation (pdf) 

Radius: 8.87 mm
Weight: 53.34 g
Density: 18.5 g/cc

Our model was recently used as a visual aid in a lecture on black holes by renown astrophysicist Brian Greene! (Black Hole featured around 22:54, but we recommend the whole lecture!)

Direct link if video fails to load.



CALCULATE ANY SCHWARZSCHILD RADIUS YOURSELF

Schwarzschild Radius Calculator

Pickup available at our Tulsa Storefront

Usually ready in 24 hours

Tungsten Black Hole Model

Default Title

further research
CUSTOMER REVIEWS
further research

WHAT IS TUNGSTEN?

Tungsten , or wolfram, is a chemical element with the symbol W and atomic number 74. The name tungsten comes from the former Swedish name for the tungstate mineral scheelite , tungsten which means "heavy stone".  Tungsten is a rare metal found naturally on Earth almost exclusively combined with other elements in chemical compounds rather than alone. It was identified as a new element in 1781 and first isolated as a metal in 1783. Its important ores include wolframite and scheelite .

The free element is remarkable for its robustness, especially the fact that it has the highest melting point of all the elements discovered, melting at 3,422 °C (6,192 °F; 3,695 K). It also has the highest boiling point , at 5,930 °C (10,710 °F; 6,200 K). Its density is 19.25 times that of water, comparable with that of uranium and gold , and much higher (about 1.7 times) than that of lead. Polycrystalline tungsten is an intrinsically brittle and hard material (under standard conditions, when uncombined), making it difficult to work . However, pure single-crystalline tungsten is more ductile and can be cut with a hard-steel hacksaw.

Tungsten's many alloys have numerous applications, including incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in gas tungsten arc welding , superalloys , and radiation shielding . Tungsten's hardness and high density give it military applications in penetrating projectiles . Tungsten compounds are also often used as industrial catalysts.

CUSTOMER REVIEWS

Customer Reviews

Based on 16 reviews
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J
J.M. (Virginia, United States)

Really cool item to own

W
W.T. (Virginia, United States)

Wes rated this 5 stars on Etsy

F
F. (Virginia, United States)

Fascinating item. I look forward to impressing people with what this little ball represents.

D
D.O. (Virginia, United States)

Dan rated this 5 stars on Etsy

M
M.J. (Washington, United States)
Great addition to our homeschool room

My son has been learning about black holes and I was so happy to find this representation. Packaged well and came with an informative booklet.

M
M. (Virginia, United States)

This is a gift for my husband. I felt like the store offerings were very unique and special. Everything arrived quickly.

G
G.

Gleena1613 rated this 5 stars on Etsy

B
B.M.

Got this for a stocking stuffer for my grandson and he liked it better than some of his larger gifts. Thank you, have added your store to my favorites.

L
L.B. (New York, United States)
Tungsten and Black Holes

The model was a gift for my son who is interested in both the density and weight of tungsten as well as black holes. It was an instant hit!

R
R.A.K.R. (Illinois, United States)
Lovely demo and conversation piece

love this model! The tungsten has a real heft to it, which drives home the point.

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Tungsten Black Hole Model

Tungsten Black Hole Model

$40.00