[ExI] Gravity waves?
bbenzai at yahoo.com
Fri Mar 21 20:59:37 UTC 2014
John Clark <johnkclark at gmail.com> wrote:
>On Thu, Mar 20, 2014 at 10:21 AM, Ben <bbenzai at yahoo.com> wrote:
>> Shouldn't this be "gravity waves have been inferred from the detection
>> of variations of the polarisation...", or "variations in the
>> of microwave radiation is consistent with the existence of gravity
>> waves...", etc.?
>How is that fundamentally different from "electromagnetic light waves have
>been inferred from the chemical changes made in the retina of our eye" ?
The difference is the degree of separation between the thing and the
observer. The more steps there are, the more uncertainty there is about
what is causing the result. There's a difference between a brick
falling on your foot, and you reading a message where someone claims
that a friend of a friend suffered a brick to the foot. There are fewer
possible interpretations for one than for the other, and a different
degree of certainty about the existence of the brick.
Observations of polarisation of microwaves is detection of gravity waves
in the same sense that observation of blonde hairs on a lapel is
detection of a cheating husband.
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