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Astronomers have gotten pretty good at calculating how fast the universe is expanding, but new measurements don’t line up with the predictions of well-tested laws of physics. Now scientists have a new question to ponder: Why are these numbers so different?

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Sources:
https://arxiv.org/abs/1903.07603
http://www.astronomy.com/~/link.aspx?…
https://www.nasa.gov/feature/goddard/…
https://www.eurekalert.org/pub_releas…
https://www.eurekalert.org/pub_releas…
https://www.scientificamerican.com/ar…
http://sci.esa.int/planck/60504-measu…
https://www.esa.int/Our_Activities/Sp…

image Sources:
https://www.spacetelescope.org/videos…
https://www.esa.int/spaceinimages/Ima…
https://www.spacetelescope.org/videos…
https://commons.wikimedia.org/wiki/Fi…
https://svs.gsfc.nasa.gov/20246
https://svs.gsfc.nasa.gov/vis/a030000…
https://www.esa.int/spaceinimages/Ima…
https://www.spacetelescope.org/videos…
http://hubblesite.org/image/1037/news…
https://svs.gsfc.nasa.gov/12238
https://svs.gsfc.nasa.gov/vis/a010000…
http://imgsrc.hubblesite.org/hvi/uplo…
https://www.spacetelescope.org/videos…