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    Large, Distant Comets more Common than previously thought

    July 26, 2017, Categories  Astronomy/Space

    A new study suggests that distant "long-period" comets -- which take more than 200 years to orbit the sun -- are more common than previously thought. This illustration shows how the researchers used data from NASA's Wide-field Infrared Survey Explorer (WISE) spacecraft to determine the nucleus sizes of several of these distant comets. They subtracted a model of how dust and gas behave in comets in order to obtain the core size. Credit: NASA/JPL-Caltech

    A new study suggests that distant “long-period” comets — which take more than 200 years to orbit the sun — are more common than previously thought. This illustration shows how the researchers used data from NASA’s Wide-field Infrared Survey Explorer (WISE) spacecraft to determine the nucleus sizes of several of these distant comets. They subtracted a model of how dust and gas behave in comets in order to obtain the core size. Credit: NASA/JPL-Caltech

    Comets that take more than 200 years to make one revolution around the sun are notoriously difficult to study. Because they spend most of their time far from our area of the solar system, many “long-period comets” will never approach the sun in a person’s lifetime...

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