New measurement of universe's expansion worsens 'Hubble trouble'
The most accurate observation of distant stars that periodically change in brightness may deepen the "Hubble tension," a problem with the rate at which the universe expands. The observation confirms a disparity that exists between the two major methods of measuring how fast the universe is expanding, conforming with one but not the other. The Cepheid star measurement technique expands on other methods, such as one that relies on observations of Type 1a supernovas, and this new research has strengthened that rung. The improved calibration of the Cepheid variable measurement tool means that this technique finally "takes a side" in the Hubble tension debate, providing agreement with the "late time" solution.
