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Old Jun 7th 2018, 10:04 AM   #11
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Originally Posted by Pmb View Post
...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...
Or something else.
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Old Jun 9th 2018, 06:04 AM   #12
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Originally Posted by Farsight View Post
Or something else.
Where we are with dark matter has a historical counterpart. When Rutherford showed that the atom had a very small positively charged particle at the center (the nucleus) there were some grave doubts about it since the nucleus should explode due to all that charge in such a small space. Clearly it doesn't explode. So there had to be a force there keeping it together even if we didn't know what it was. Eventually we were able to work up a theory on the strong nuclear force.

Just because we don't know what something is doesn't mean that we don't know that the something has to be there.

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Old Jun 9th 2018, 10:54 AM   #13
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Originally Posted by topsquark View Post
Where we are with dark matter has a historical counterpart...
I disagree. Because in 1915 Einstein said the energy of the gravitational field shall act gravitatively in the same way as any other kind of energy. That's spatial energy. And it isn't made of WIMPs.
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Old Jun 9th 2018, 04:33 PM   #14
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Originally Posted by Farsight View Post
I disagree. Because in 1915 Einstein said the energy of the gravitational field shall act gravitatively in the same way as any other kind of energy. That's spatial energy. And it isn't made of WIMPs.
You are right. My point is that sometimes we know something has to be there even if we don't know what it is.

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