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  • BBC Sky at Night

    BULLETIN

    Jun 16, 2022 5 minutes

    Hubble refines the Universe’s expansion rate

    The new measurement could help solve one of the biggest problems in cosmology

    Using over 30 years of observations, the Hubble Space Telescope has helped to create the most precise measure of the expansion of the Universe, known as the Hubble constant. The new value of 73km/sec/Mpc (kilometres per second per megaparsec) is now accurate to within one per cent, and means it would take the Universe 10 billion years to double in size.

    “The Hubble constant is a very special number. It can be used to thread a needle from the past to the present for an end-to-end test of our understanding of the Universe, ” says Licia Verde, from the University of Barcelona, who took part in the study.

    Astronomers have long been plagued by a serious issue when measuring

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