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    Galaxies grow Bigger and Puffier as they Age

    April 23, 2018, Categories  Astronomy/Space

    This is a long-exposure image from NASA's Hubble Space Telescope of massive galaxy cluster Abell 2744. It shows some of the faintest and youngest galaxies detected in space. Credit: NASA/ESA/STScI

    This is a long-exposure image from NASA’s Hubble Space Telescope of massive galaxy cluster Abell 2744. It shows some of the faintest and youngest galaxies detected in space. Credit: NASA/ESA/STScI

    A new international study involving ANU and Sydney University has found that galaxies grow bigger and puffier as they age. Professor Matthew Colless from ANU said that stars in a young galaxy moved in an orderly way around the galaxy’s disk, much like cars around a racetrack...

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