How fast is the universe expanding? Astronomers may be one step closer to resolving 'Hubble trouble'

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The local universe may be expanding more slowly than previously thought, scientists have found. The discovery, made in two separate pieces of research, could relieve one of the most troubling headaches in cosmology, the Hubble tension.
The Hubble constant — named after Edwin Hubble, the astronomer who found in the early 1900s that the universe is expanding — is the rate at which that expa