A new estimate of the Hubble constant – the rate at which the universe is expanding – is baffling many of the finest minds in the cosmology community

A crisis of cosmic proportions is brewing: the universe is expanding 9% faster than it ought to be and scientists are not sure why.

The latest, most precise, estimate of the universe’s current rate of expansion – a value known as the Hubble constant – comes from observations by the European Space Agency’s Gaia mission, which is conducting the most detailed ever three-dimensional survey of the Milky Way.

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