[Science Thursday] Star Crust is Ten Billion Times Stronger Than Steel

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mrk

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"It sounds dramatic, but it's true,"
Said study team member Charles Horowitz of Indiana University.

:o
The Man of Steel has nothing on the collapsed cores of massive snuffed-out stars, scientists say.

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A new computer model suggests that the outer crusts of so-called neutron stars are the strongest known material in the universe.

To determine the breaking point of a neutron star's crust, the team modeled magnetic field stresses and crust deformation for a small region of the star's surface.

The results showed that the crust of a neutron star can withstand a breaking strain up to ten billion times the pressure it would take to snap steel.

"It sounds dramatic, but it's true," said study team member Charles Horowitz of Indiana University.

Breakable

Neutron stars are the second densest objects in the universe after black holes. A teaspoonful of neutron star matter would weigh about a hundred million tons.

Unlike normal stars, neutron stars have solid outer shells that hold a soup of superdense subatomic particles, astronomers believe.

Even though a neutron star's crust is incredibly strong, it can crack due to stress from the star's powerful magnetic field, experts say.

Astronomers think that crust cracks can create "magnetar flares," extremely energetic gamma-ray bursts from strongly magnetized neutron stars.

(Related picture: "Pulsar Creates Cosmic 'Hand.'")

Stellar Goose Bumps

The model also has implications for the height of neutron star "mountains," irregularities on the surfaces of the stars that are thought to help create gravitational waves.

The waves are theoretical ripples in the fabric of space-time that race outward at light speed from massive spinning objects.

The new calculations suggest the mountains are more like stellar goose bumps than giant peaks.

For instance, the mountains can be a few kilometers wide but only about a centimeter (0.39 inch) high, Horowitz said.

The research will be detailed in an upcoming issue of Physical Review Letters.

Article


Impressive :cool:
 
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Neutrons stars are held together by the degenerate pressure of neutrons.

Its worth nothing that all the protons and electrons have combined to form neutrons, which are usually unstable. (certainly true in the core anyways)

The average size of neutron star is about 10s of km. The size of a large city like London but weigh more than our sun.

As a result the densities are uberly high, pretty close the density of a nucleus. Hence, the entire star in some ways is a nucleus of a atom
 
Not hugely surprising that it is stronger in that it is billions of times heavier.

Like comparing air and steel really.
 
Their version of strength is a bit open-ended though. How did they model the breaking strain ? Does it withstand temperatures/chemical reactions/high power radiation? What about compression, elasticity, Tension, Brittleness, Rigidity or hardness. Strength means nothing here.

By their statement - it just means its an extremely dense material - which means absolutely nothing in terms of strength. And the mere fact it is badly affected by a magnetic field means it has a very real weakness in it's structure.

From a bunch of scientists - a statement saying it's the 'strongest material' is just playing up to dumb people. Tell us what you mean if it's really that fantastic. I bet a perfect Carbon nanotube would kick its rear-end if you fired a teaspoon of the two at each other ;)
 
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Does it matter in space? I thought everything was weightless? Or does it create it's own gravitational field, and therefore impart weight to itself?

So where do you build the spaceship? Surely when it enters our atmosphere it could do some big damage.
 
The gravitational pull of a ship built from Nutron star material would be immense.

Not to mention how do you intend to collect/shape something so dense and strong...
 
thats pretty awesome... now anyone wanna tell me how you'd get the stuff to be moulded into a structure usable for a ship?? I dont think your run of the mill blow torch would "cut it" bazzing!
 
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