Neutron star crust is ten billion times as strong as steel
Thursday, April 16, 2009

From only performed simulations shows that the crust of neutron is over ten billion times as strong as steel, which means that the surface of this very dense objects are strong enough to flatten the star, which arise from the speeds dealing with which maintain and rotate. These gravitational waves produced on our planet may be on the basis of experiments only.

Neutron stars are in fact the cores left over when life is relatively massive stars ending in the form of a supernova. Because the objects in their possession the same mass as the sun and these "packages" is in a sphere of only twenty kilometers in diameter, these objects have an extreme high density. Some of them run several hundred times per second to their axis and this would great waves or ripples in space time created, although it may occur only when the surface of the star is asymmetrical due to the presence of flat parts or different. Material from a nearby star could cause such irregularities. But what is already longer asked is whether the surface of a neutron star is strong enough to withstand the weight of bubbles and such fluctuations.

The crust will normally consist of atoms crystals rich in neutrons. Since experiments in laboratories of the exceptional circumstances on the surface of such stars can not mimic after , astronomers assumed that the crust would be as strong as the strongest substances on earth. The new computer simulations, carried out by Charles Horowitz and Kai Kadau of the Los Alamos National Laboratory, have shown that the crust is much stronger. Materials like rock and steel break easily because they contain small holes, but the enormous pressure in neutron stars would ensure that they are removed and the crystals up ten billion times as strong as steel.

More information: 'Star crust is 10 billion times stronger than steel "(New Scientist)

Translated version of http://www.newscientist.com/article/dn16948-star-crust-is-10-billion-times-stronger-than-steel.html

Source: astroversum.nl /


Star crust is 10 billion times stronger than steel
Saturday, April 18/09


The crust of a neutron star is 10 billion times stronger that steel, according to new simulations. This makes the surface of this ultra-dense stars strong enough to stand "bumps" on the support surface, which can produce gravitational waves detectable on earth are. A neutron star consists of the surviving core of a star that exploded as a supernova. Such a core has an incredibly high density, they address the mass of the sun into a sphere only 20 kilometers in diameter.

They can also hundreds of times per second to their axis. Due to their extreme gravity and rotation speed can potentially high neutron wrinkles in space-time production - but only if the surface bumps or other imperfections, such an asymmetric neutron star shape. There are several mechanisms proposed to produce such bumps. Thus, for example, the star may transfer matter of an accompanying star, the matter then balanced on the surface of the neutron star is spread. This resulting bumps would, theoretically, long-time stability can be.

Neutron stars are considered to consist of a liquid "soup" of neutrons, covered with a crunchy crust forms of crystal nuclei (neutrons and protons) and with a very thin "atmosphere" of loose electrons. One of the biggest issues in this matter was the strength of the crust. Would this really a mountain can support, or the crust will simply collapse under the weight?

Laboratory experimentation impossible because the extreme conditions of a neutron star can replicate, has been assumed that the strength of the crust would be similar to that of the strongest substances on earth. New computer simulations have shown that the strength of the crust of a neutron star must be much higher.


Materials such as stone and steel can break at a certain pressure, as the constituent crystals holes and other imperfections may show, which can be connected. This will result in a network of fissures and cracks, which will ultimately collapse under the prevailing pressure. The enormous pressures in a neutron star, the most failures, however, level out, making exceptional gift crystals can be formed. These are much harder to break a block of neutron star crust can be 20 times more distorted than a stainless steel block before breaking.

However, the atoms in a crust much closer consecutive caught than steel, so the pressure to reach the breaking point 10 billion times higher! A stronger crust means that a neutron star can support more bumps than expected: a "mountain", 10 centimeters above the surface! This may seem not much, but because of the enormous gravity of a neutron star is comparable to Mount Everest on the surface of a dwarf planet.

All in all, the maximum height of a mountain on a neutron star is 10 times higher than considered. This means that the gravitational waves produced can be 100 times stronger than expected, so they are easy to detect by experiments on the earth's surface, such as the U.S. Laser Interferometer Gravitational Wave Observatory, or LIGO.


Source: New Scientist

Translated version of http://www.star-people.nl/index.php?module=news&id=151
Source: astrostart

Translated version of http://www.astrostart.nl/index.php?option=com_content&task=view&id=1584&Itemid=1