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Post by Eugene 2.0 on Apr 16, 2021 17:07:11 GMT
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Post by jonbain on Jul 23, 2021 14:22:13 GMT
When astrophysicists first started estimating the
amount of mass in galaxies, it was a statistical
measurement based on the amount of light they emitted.
This came from the amount of light proportional to
mass in our solar system.
But then came "gravitational lensing" - where light
is bent by gravity. It was then realized that there
is quite a bit more matter, NOT associated with the
light model.
This extra matter was simply labelled "dark matter"
to separate it from the previous estimate.
So there are more un-shining objects in galaxies,
like planets and dust and asteroids, than was
previously estimated.
That is all it is.
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