Date: 4/10/2020 17:19:48
From: Tau.Neutrino
ID: 1628229
Subject: Measuring Light by echo mapping faraway Black Holes.
“Echo Mapping” Light Bursts From Supermassive Black Holes in Faraway Galaxies to Measure Vast Cosmic Distances
Matter swirling around supermassive black holes creates bursts of light that “echo” in nearby dust clouds. These traveling signals could serve as a new cosmic yardstick.
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Date: 5/10/2020 03:02:31
From: mollwollfumble
ID: 1628381
Subject: re: Measuring Light by echo mapping faraway Black Holes.
Tau.Neutrino said:
“Echo Mapping” Light Bursts From Supermassive Black Holes in Faraway Galaxies to Measure Vast Cosmic Distances
Matter swirling around supermassive black holes creates bursts of light that “echo” in nearby dust clouds. These traveling signals could serve as a new cosmic yardstick.
more…
It has been done, it doesn’t work very well because black holes of all descriptions turn out to be poor yardsticks. Supernovae are better.
Here are some active galaxy light echoes.
