He says a star probably passes through the Oort Cloud every 100

admin on 4 de Fevereiro de 2014

Alien star system buzzed the Sun

canada goose outlet ontario Scholz’s star was not alone; it was accompanied on its travels by an object known as a brown cheap canada goose uk dwarf. These are essentially failed stars that lacked the necessary mass to get fusion going in their cores. canada goose outlet ontario

canada goose outlet online uk The findings are published in Astrophysical Journal Canada Goose Coats On Sale Letters. canada goose outlet online uk

canada goose outlet locations in toronto Observations of the dim star’s trajectory suggest that 70,000 years ago this canada goose uk outlet cosmic infiltrator passed within canada goose uk shop 0.8 light years of the Sun. By comparison, Proxima Centauri is 4.2 light canada goose black friday sale years away. canada goose outlet locations in toronto

canada goose outlet hong kong Close encounterIn the paper, astronomers led by Eric Mamajek at the University of Rochester, New York, say they are 98% certain that Scholz’s star travelled through what is known as the “outer Oort Cloud” a region at the edge of the Solar System filled with trillions of buy canada goose jacket cheap comets a mile or more across. canada goose outlet hong kong

canada goose outlet in chicago This region is like a spherical shell around the Solar System and Canada Goose Parka may extend out to as much as 100,000 Astronomical Units, or AU (one AU is the distance between the Earth and the Sun). canada goose outlet in chicago

canada goose outlet london uk The Oort Cloud canada goose store is thought to give rise to long period comets that can swing past the Sun when their orbits are disturbed. canada goose outlet london uk

canada goose outlet online reviews To determine the trajectory of the star, the researchers needed two pieces of information: the change in distance from the Sun to the star uk canadagoose outlet (its radial velocity) and the star’s motion Canada Goose sale across the sky (its tangential velocity). canada goose outlet online reviews

canada goose outlet price Scholz’s star currently lies 20 light years away making it a fairly nearby system. But it showed very slow tangential cheap Canada Goose motion for a canada goose factory sale star this close. This indicated that it was either moving canada goose uk black friday away from us or towards a future close encounter with the Solar System. canada goose outlet price

canada goose discount uk The radial velocity measurements confirmed that the binary star system was actually speeding away from us. By tracing its movements back in time, they found its close shave with the Sun occurred some Canada Goose Outlet 70,000 years ago. canada goose discount uk

canada goose outlet online store review Grand theft Oort o?A star passing through the Oort Cloud could potentially play gravitational havoc with the orbits of comets there, sending them on trajectories into the inner canada goose coats Solar System. But Dr Mamajek canada goose clearance believes the effects of Scholz’s star on our cosmic neighbourhood were “negligible”. canada goose outlet online store review

canada goose outlet uk sale “There are trillions of comets in the Oort cloud and likely some of them were perturbed by this object,” he told BBC News. canada goose outlet uk sale

canada goose victoria parka outlet “But so far it seems unlikely that this star actually triggered a significant ‘comet shower’.” canada goose victoria parka outlet

canada goose outlet store quebec The effect of a passing star on the Oort Cloud canadian goose jacket is a function of the star’s mass, speed and proximity. The worst case scenario for stirring up comets would be a slow moving, massive star canada goose clearance sale that came close to the Sun. canada goose outlet store quebec

canada goose outlet in toronto Scholz’s star came relatively close, but the binary system (the red dwarf and its brown dwarf companion) has a low mass and it was speeding by. These factors conspired to make its effect on the Oort Cloud very small. canada goose outlet in toronto

canada goose factory outlet While this is the closest flyby canada goose coats on sale detected Canada Goose online so far, Dr Mamajek thinks it’s not uncommon for alien stars to buzz the Sun. He says a star probably passes through the Oort Cloud every 100,000 canada goose years, or so. canada goose factory outlet

canada goose outlet online store But he suggests an approach as close or closer than uk canada goose that made by Scholz’s star is somewhat rarer. Dr Mamajek said mathematical simulations show such an event occurson average about once every nine million years. canada goose outlet online store

canada goose outlet parka “So it is a bit of a strange coincidence that we happen to have caught Canada Goose Online one that passed so close within the past 100,000 years or so,” he said. canada goose outlet parka

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