Tag Archives: Expansion

The expanding universe – cosmic dynamics

The universe is expanding. For billions of years. How fast is the expansion? Measuring this rate is a big deal in physics. Why?

Gravitationally lensed supernova
Galaxy cluster PLCK G165.7+67.0 is shown, with the features of background, gravitationally lensed galaxies appearing behind it. The big orange arc at left, called “Arc 2,” contains the second-most distant type Ia supernova, and it was seen by JWST on repeat in all three images, as annotated here. Credit: B. Frye et al., ApJ submitted, 2023; Annotations: E. Siegel
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