On Saturday, February 17, 2024 at 6:17:54 PM UTC-6, RichD wrote:
In the first black hole collision, in 2015, LIGO claimed that 3 solar
masses were radiated. How do they know that?
They know the "song" the collision event produced, as predicted by GR,
so they know the masses of the initial black holes. They know the displacement of every atom across a wavefront of many tens of billions
of square light years, and they have an attendant energetic light flash
that helps tie down the position in the quadrant. That GR makes a
prediction of how much mass is lost from "before" to "after", has some ability to quantify.
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