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Shock waves may have jolted the infant cosmos. Clumpiness in the density of the early universe piled up into traveling waves of abrupt density spikes, or shocks, like those that create a sonic boom,
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, scientists say.
Although a subtle effect,
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, the shock waves could help scientists explain how matter came to dominate antimatter in the universe. They also could reveal the origins of the magnetic fields that pervade the cosmos. One day,
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, traces of these shocks, in the form of gravitational waves, may even be detectable.
Scientists believe that the early universe was lumpy — with some parts denser than others. These density ripples,
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, known as perturbations, serve as the seeds of stars and galaxies. Now,
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, scientists have added a new wrinkle to this picture. As the ripples rapidly evolved they became steeper, like waves swelling near the shore, until eventually creating shocks analogous to a breaking wave. As a shock passes through a region of the universe, the density changes abruptly,
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, before settling back down to a more typical, slowly varying density. “Under the simplest and most conservative assumptions about the nature of the universe coming out of the Big Bang, these shocks would inevitably form,” says cosmologist Neil Turok of the Perimeter Institute for Theoretical Physics in Waterloo, Canada.
In a paper published September 21 in Physical Review Letters,
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, Turok and Ue-Li Pen of the Canadian Institute for Theoretical

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of 29 and 36 suns,
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, these black holes were roughly twice as massive as the previous record holders.
Those masses actually aren’t too shocking, says Jeffrey McClintock, an astrophysicist at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass. Very massive stars, though rare, should give rise to very massive black holes. What would have been more surprising, he says,
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, is if LIGO failed to turn up any black holes this large. “If the nearest 1,000 stars had been investigated and we hadn’t found any planets,
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, I would go back to church,” he says. “I feel the same way about two 30-solar-mass black holes.”
There are heavier black holes. Those monsters live in the centers of galaxies and can weigh billions of times as much as the sun. But they are different beasts entirely, probably built up as galaxies collide. Black holes such as those detected by LIGO are born when a massive star dies. And given their masses,
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, “they likely formed in a fairly different environment than the Milky Way,
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,” Ravi says.
How much mass a star ends up with at the end of its life depends partly on its store of elements heavier than helium. Atoms such as carbon,
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, magnesium and iron present larger targets to the light that’s escaping a star. As light races outward, it bumps into these atoms,
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, which in turn shove the surrounding gas along. The heavy elements behave like little snowplows attached to the photons, whittling away at the star’s mass as the light radiates into space. To make black holes as massive as LIGO’s,
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, the original stars must have had fewer of these heavy elements

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When we showed you a first look at the Air Jordan 20 Stealth, many were shocked and had reason to. Sadly at the time we only had one image of the sneakers but now we have a more in depth look at whats to come.
First off, across the strap where the laser etching is will be in gold. The first showed that the gold stuck out which many didn’t like. With this new set, it appears that its more subtle but lighting could be tricking us. What you might not see right off the bat is the addition of nubuck material.
The Air Jordan 20 Stealth has a slated release date of March 14th 2015.
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