News OT: Next take on the ever-elusive Hubble parameter, or, "Astrophysicists fill in 11 billion years of our universe’s expansion history"


Diamond Member
Dec 10, 2016
Already old news, but I heard of it only today:

July 19, 2020 — press release from SDSS
The Sloan Digital Sky Survey (SDSS) released today a comprehensive analysis of the largest three-dimensional map of the Universe ever created, filling in the most significant gaps in our possible exploration of its history.

“We know both the ancient history of the Universe and its recent expansion history fairly well, but there’s a troublesome gap in the middle 11 billion years,” says cosmologist Kyle Dawson of the University of Utah, who leads the team announcing today’s results. “For five years, we have worked to fill in that gap, and we are using that information to provide some of the most substantial advances in cosmology in the last decade.”

Read more in the linked press release about the map, dark energy, and the Hubble Constant which is anything but constant...

The Hubble Constant measurements from SDSS and other surveys are inconsistent with the measurements from nearby galaxies, which find a value close to 74 in these units – as opposed to 68 for the SDSS. Only with the data taken from SDSS and other experiments in the last decade has it been possible to reveal this discrepancy.


And: Apparently the Universe is flat after all... ;-)