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CREDIT: ESA/NASA/REX Shutterstock

caption

CREDIT: ESA/NASA/REX Shutterstock Mandatory Credit: Photo by ESA/NASA/REX/Shutterstock (5599033a) Wolf?Rayet star known as WR 31a Hubble captures 'blue bubble' star - 26 Feb 2016 Sparkling at the centre of this NASA/ESA Hubble Space Telescope image is a Wolf?Rayet star known as WR 31a, about 30,000 light-years away in the constellation of Carina (The Keel). The blue bubble appearing to encircle WR 31a is a Wolf?Rayet nebula, an interstellar cloud of dust, hydrogen, helium and other gases. Created when speedy stellar winds interact with the outer layers of hydrogen ejected by Wolf?Rayet stars, these nebulae are frequently ring-shaped or spherical. The bubble, estimated to have formed around 20,000 years ago, is expanding at a rate of around 220,000 kilometres (136,700 miles) per hour. The lifecycle of a Wolf?Rayet star is only a few hundred thousand years, a blink of an eye in cosmic terms. Despite beginning life with a mass at least 20 times that of the sun, Wolf?Rayet stars typically lose half their mass in less than 100,000 years. WR 31a is no exception to this case. It will, therefore, eventually end its life as a spectacular supernova.

headline arch21

created date 2016-02-26

credit ESA/NASA/REX/Shutterstock/EAST NEWS

source Rex Features

byline ESA/NASA/REX/Shutterstock

original transmission reference Rex_Hubble_captures_blue_bubble_star_5599033A

weight 0,95MB

size 21cm x 22cm by 300dpi

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