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Re: What is mass? 350 years of not knowing it.

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Thomas 'PointedEars' Lahn wrote:

> There is an energy density, ρ_E ≔ dE/dV, too.  In fact, it is (in natural
> units) the time—time component of the energy–momentum tensor T_μν in the
> Einstein Field Equation of general relativity.
> 
> With it, and realizing that E = m c² at relative rest, one can explain why
> and how the spacetime in the vicinity of an object with non-zero mass is
> curved, which leads to observable effects that we call “gravity”,
> “gravitational time dilation”, “gravitational redshift/blueshift”, and
> “deflection of light”.

And, I should add, “gravitational waves” as they become increasingly 
important in astrophysics, allowing us to observe places from where light 
does not get in or out, possibly/hopefully even our universe before 378'000 
years after its expansion began.


PointedEars
-- 
“Nature uses only the longest threads to weave her patterns
 so that each small piece of her fabric reveals the organization
 of the entire tapestry.”
   —Richard Feynman, theoretical physicist, “Messenger Lecture” 1 (1964)

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What is mass? 350 years of not knowing it. Richard Hertz <hertz778@gmail.com> - 2022-12-14 16:10 -0800
  Re: What is mass? 350 years of not knowing it. JanPB <filmart@gmail.com> - 2022-12-14 16:47 -0800
    Re: What is mass? 350 years of not knowing it. Maciej Wozniak <maluwozniak@gmail.com> - 2022-12-14 17:57 -0800
    Re: What is mass? 350 years of not knowing it. Brent Làconi <oll@ntonoobe.bc> - 2022-12-15 20:42 +0000
  Crank Richard Hertz reduced to trolling "Dono." <eggy20011951@gmail.com> - 2022-12-14 18:05 -0800
  Re: What is mass? 350 years of not knowing it. The Starmaker <starmaker@ix.netcom.com> - 2022-12-14 22:00 -0800
    Re: What is mass? 350 years of not knowing it. Richard Hertz <hertz778@gmail.com> - 2022-12-15 05:38 -0800
      Re: What is mass? 350 years of not knowing it. "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2022-12-15 11:26 -0800
      Re: What is mass? 350 years of not knowing it. The Starmaker <starmaker@ix.netcom.com> - 2022-12-16 11:11 -0800
        Re: What is mass? 350 years of not knowing it. Trolidan7 <Trolidan7@eternal-september.org> - 2022-12-17 11:53 -0800
  Re: What is mass? 350 years of not knowing it. "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2022-12-16 11:08 -0800
    Re: What is mass? 350 years of not knowing it. Dario De filippis <ioss@delloidl.id> - 2022-12-16 19:13 +0000
      Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-17 01:39 +0100
        Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-17 01:47 +0100
        Re: What is mass? 350 years of not knowing it. Dario De filippis <ioss@delloidl.id> - 2022-12-17 13:51 +0000
          Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-17 22:35 +0100
            Re: What is mass? 350 years of not knowing it. Dario De filippis <ioss@delloidl.id> - 2022-12-17 21:51 +0000
              Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-17 23:10 +0100
                Re: What is mass? 350 years of not knowing it. Dario De filippis <ioss@delloidl.id> - 2022-12-17 23:49 +0000
                Re: What is mass? 350 years of not knowing it. Dario De filippis <ioss@delloidl.id> - 2022-12-18 03:02 +0000
              Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-17 23:19 +0100
                Re: What is mass? 350 years of not knowing it. Dario De filippis <ioss@delloidl.id> - 2022-12-17 23:43 +0000
                Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-18 19:37 +0100
                Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-18 19:37 +0100
                Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-18 19:39 +0100
                Re: What is mass? 350 years of not knowing it. Vitaliy Bazzoli <zvt@viavzl.oi> - 2022-12-18 19:36 +0000
                Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-18 21:12 +0100
                Re: What is mass? 350 years of not knowing it. Vitaliy Bazzoli <zvt@viavzl.oi> - 2022-12-18 20:58 +0000
                Re: What is mass? 350 years of not knowing it. whodat <whodaat@void.nowgre.com> - 2022-12-18 15:58 -0600
                Re: What is mass? 350 years of not knowing it. Vitaliy Bazzoli <zvt@viavzl.oi> - 2022-12-18 19:51 +0000
                Re: What is mass? 350 years of not knowing it. whodat <whodaat@void.nowgre.com> - 2022-12-18 16:00 -0600
                Re: What is mass? 350 years of not knowing it. Vitaliy Bazzoli <zvt@viavzl.oi> - 2022-12-18 22:47 +0000
                Re: What is mass? 350 years of not knowing it. whodat <whodaat@void.nowgre.com> - 2022-12-18 17:04 -0600
                Re: What is mass? 350 years of not knowing it. Vitaliy Bazzoli <zvt@viavzl.oi> - 2022-12-18 23:24 +0000
                Re: What is mass? 350 years of not knowing it. whodat <whodaat@void.nowgre.com> - 2022-12-18 18:56 -0600
                Re: What is mass? 350 years of not knowing it. whodat <whodaat@void.nowgre.com> - 2022-12-18 22:06 -0600
                Re: What is mass? 350 years of not knowing it. Vitaliy Bazzoli <zvt@viavzl.oi> - 2022-12-19 19:20 +0000
                Re: What is mass? 350 years of not knowing it. whodat <whodaat@void.nowgre.com> - 2022-12-19 14:21 -0600
                Re: What is mass? 350 years of not knowing it. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-12-19 01:42 +0100
            Re: What is mass? 350 years of not knowing it. Dario De filippis <ioss@delloidl.id> - 2022-12-17 21:58 +0000

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