False-colour Image Of Dust Shell Around R Cor Bor Photograph by Noao/science Photo Library

False-colour Image Of Dust Shell Around R Cor Bor

by Noao/science Photo Library

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Title

False-colour Image Of Dust Shell Around R Cor Bor

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Noao/science Photo Library

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Photograph - Photograph

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False-colour infrared image showing an enormous shell of dust surrounding the bright supergiant star R Corona Borealis (R Cor Bor). The image was made by the Infrared Astronomical Satellite at a wavelength of 100 microns. The shell is thought to have been created by a mass-loss process which ceased thousands of years ago. It is now around 25 light years across. R Cor Bor is a variable star. It is usually visible to the naked eye (magnitude 6.0), but occasionally drops in brightness to as faint as 13th magnitude. The drops take place abruptly & unpredictably & last for 1-2 months.

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October 2nd, 2018

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