Astronomy Cast Full Raw Feed · Fraser Cain & Dr. Pamela L. Gay

Ep. 749: Dark Energy Changing Over Time

·56 min·5 clips
DESI data hints that dark energy is dropping over time, potentially averting a big rip in the universe.
This episode explores the Hubble tension, where measurements of the universe's expansion rate conflict, and discusses new evidence from DESI suggesting dark energy may be changing over time. The hosts explain cosmological concepts, review historical debates, and highlight upcoming missions that could resolve these mysteries.

As heard by us

A clear look at the dark-energy puzzle, anchored by the uneasy gap between the best probes.

This episode keeps dark energy at the center of a real measurement problem: whether the early-universe numbers and the nearby-universe numbers actually agree, or whether the universe is signaling change over time.

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Why you'd press play

You want the dark-energy puzzle and why the measurements still do not fully line up.

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