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Old May 20th 2018, 08:34 AM   #1
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Does dark matter bend light?

Does dark matter bend light?
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Old May 20th 2018, 09:37 AM   #2
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Originally Posted by Daniel9 View Post
Does dark matter bend light?
Very cool question. You get a gold star to put on your head. (THa kind of dates me a bit. Lol)

Yes. All matter bends light. But the matter has to be concentrated enough to make the bending detectable.

Here's a good example of dark matter bending light which was doscovered

https://www.space.com/3806-hubble-re...rk-matter.html
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Old May 21st 2018, 02:48 AM   #3
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Originally Posted by Daniel9 View Post
Does dark matter bend light?
Yes. The bending of light by celestial bodies is called "gravitational lensing". The lensing effect has been confirmed for certain fields of view where the object that causes the lensing can be observed in addition to the lensing effects. Then, in other fields of view, there can be cases where lensing effects are observed, but the object causing it is not. We can then use the lensing effects to try and obtain knowledge of the unobserved entity (or, in other words, it is an indirect observation). Afaik, the total mass of galaxies is required to explain the lensing effect in most cases (observed matter + dark matter component).
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Old Jun 5th 2018, 03:37 PM   #4
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They "invented" dark matter to make their formulas and how they apply to galaxies come out right. But then they found what they overlooked and decided that there doesn't need to be any dark matter.
Isn't it just awesome how scientists "fill in the gap" but when theists say there must be a creator because inanimate matter does not arrange it self in super complex forms and give itself life and make its own genetic code for cellular maintenance and reproduction, well no no no you can't "fill in the gap". That's "unscientific"!
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Old Jun 5th 2018, 06:46 PM   #5
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Originally Posted by fisica75 View Post
They "invented" dark matter to make their formulas and how they apply to galaxies come out right. But then they found what they overlooked and decided that there doesn't need to be any dark matter.
Isn't it just awesome how scientists "fill in the gap" but when theists say there must be a creator because inanimate matter does not arrange it self in super complex forms and give itself life and make its own genetic code for cellular maintenance and reproduction, well no no no you can't "fill in the gap". That's "unscientific"!
When you make accusations like this you need to back them up. Especially since everything you said is wrong.
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Old Jun 5th 2018, 06:56 PM   #6
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Show me the evidence that "dark matter" exists.
(hint- it only exists in your mind)
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Old Jun 6th 2018, 01:51 AM   #7
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The whole of existence is only in your mind!

OK, dark matter is a "guess" to fill a gap in the model we have constructed of what we observe.
But then that can be said of literally everything.

If you can come up with a better guess, go ahead.
There is little "direct" evidence of dark matter,
and there are plenty of imaginative thinkers looking for alternative ideas,
but dark matter remains the best idea we have (at the moment).
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Old Jun 6th 2018, 03:04 AM   #8
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Originally Posted by fisica75 View Post
Show me the evidence that "dark matter" exists.
(hint- it only exists in your mind)
Here's a review paper on dark matter with an explanation of the history of observations that led to dark matter:
https://arxiv.org/pdf/1006.2483.pdf

(hint: dark matter is just the name for the mass discrepancy required to explain observed rotation profile of galaxy spiral arms. It exists even if the actual solution to the problem is not additional matter, but MOND or something else).
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Old Jun 6th 2018, 04:55 AM   #9
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Theological side-effects.

Regarding the introduction of a Deity to fill the knowledge gaps,
Occam's razor comes into play.

Invoking a Deity unavoidably introduces a whole raft of additional philosophical, moral, and of course theological issues.

Dark matter solves the observed modelling gap, with a minimum of side-effects.

Looking over historical Deity centric explanations (eg Zeus throwing Lightening bolts)
we find that as knowledge of the phenomena increases,
the theistic explanation loses credibility, even among theistic believers.
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Old Jun 6th 2018, 02:27 PM   #10
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Originally Posted by fisica75 View Post
Show me the evidence that "dark matter" exists.
(hint- it only exists in your mind)
That kind of statement tells me you don't understand the scientific method. First of all you seem to want proof that dark matter exists and physics isn't about "proving." Watch this video and learn something important:
http://www.newenglandphysics.org/com...an_Guth_04.mp4


All dark matter is, is matter we can't see. It could be massive gas giants, black holes, brown dwarfs or perhaps even black dwarfs. OR particles which interact only through gravitation.

All postulated entities which attempt to explain things have the evidence for them already existing. In this case we know dark matter by what it does gravitationally.

As far as other evidence goes - don't be so lazy. Do a search on Google for it.
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