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    Exactly how Fast is the Universe Expanding?

    July 11, 2019, Categories  Astronomy/Space

    Radio wave observations and model of fireball from neutron star collision
    The collision of two neutron stars flung out an extraordinary fireball of material and energy that is allowing a Princeton-led team of astrophysicists to calculate the Hubble constant, the speed of the universe’s expansion. They used a super-high-resolution radio “movie” (left) that they compared to a computer model (right)

    Astrophysicists are closing in on the Hubble constant. The collision of two neutron stars (GW170817) flung out an extraordinary fireball of material and energy that is allowing a a team of astrophysicists to calculate a more precise value for the Hubble constant, the speed of the universe’s expansion. Previous estimates put the value between 66 and 90 km/s/Mpc, which this team refined to between 65.3 and 75.6 km/s/Mpc.

    Exactly how fast is the universe e...

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