Cepheid variable stars

This image of NGC 5468, a galaxy about 130 million light-years from Earth, combines data from the Hubble and James Webb space telescopes. It is the most distant galaxy in which Hubble has detected variable Cepheid stars. These stars serve as important landmarks for measuring the expansion rate of the universe.

The Webb and Hubble space telescopes confirm the universe's expansion rate, the puzzle continues

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Web sightings provide new insights into a decade-long mystery