General discussion

Obvious what dark matter is

Dark matter is just matter. Consider the space between known matter. Consider the size of the Universe.

Now "remove" all the, what we call known matter (15%-25%?).

All the remaining space is filled with matter that is molecules in size more or less. Can't be detected can't be seen.


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Ya, you betcha.

Still potholes on my street, though.Happy
Have you visited Great site. You'll find similar minds there.

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What makes you think it's not just a void and filled with nothing?

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It is better logic than to make up a substance.

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visible matter as in galaxies - is only 5% mass and energy

(approx.) last time I checked. Dark matter is detectable from surveys of galaxy rotation curves and galaxy cluster movement analysis - it is inferred because otherwise the rotation rates actually seen would not make sense from a gravitational standpoint from just what mass is _known_ from stars, gas, interstellar and "halo" objects - all this data from visible light (stars) plus radio telescope data (gas, molecular and otherwise such as ionized gas (single atoms stripped of electrons). Sooo, the idea is there must be "dark" matter around galaxies big and small to hold it all together - rotation rates are too fast to be explained by "normal" interacting matter, thus *something* that does not interact or is otherwise visible or detectable is there. We _only_ know about it from the mismatch between what the rotation rates should be and what is actually observed.

The dark matter is around 27% of total mass of the galaxies, clusters, everything in the universe. The unknown form (really unknown!) of dark "energy" - is 68% added to this makes 85% total mass plus dark matter = 95% mass - energy content. this leaves what we *used to* think of everything as only 5%. The Wikipedia article goes into far more detail about
how astrophysicists figured all this out - quite recently, I should add!

Anyway, now that that's as clear as mud, I'll bow out... :^)

Rick " I'm still stuck trying to wrap my brain around time-space " Jones

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(NT) "In the beginning God ..."
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Dark matter a theory to excuse logic.

Atoms, for example, (matter) that makes up a solid detectable 'body' is 0.000000001% matter - but solid, detectable and heavy - such as a boulder.

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I'm of the same mind -

to me, the theories that account for the discrepancies through modified forms of general relativity (and other theories, too) are much more plausible to me, but run into huge difficulties accounting for the data recorded. To physicists, the "elegant" solutions are the "best" - and so rewarded with more support.

But I'm reminded of the notion that the Universe is under no stricture to be comprehensible to _us_ at all... :^)


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Elegant is used in maths as well.

Among other things, it means 'no kluges to make it work'.
Stuff Ockham would like.

More than once I've seen scientists say that some natural phenomena is elegant.
Stuff Jehovah would like. "And he saw that it was good ..."

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Forgot. Add "no kluges".

Unlike today's physics and cosmology. Grin

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Hmm, thought it was spelled Kludge ?

But yes, I'm aware of William and his 'razor'. Works well most of the time, but not always...


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and also

Acts 17:28 'For in Him we live and move and have our being.'

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Good point.

I've always marveled at the apparent contradiction. A brick is mostly space, but it will break your head.
The answer is simple. The subatomic forces at work make it seem solid.

Except, that explanation isn't that simple, is it?
"In the beginning God created the heavens and the earth", just don't ask me how. Happy

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(NT) And I'm still waiting on those potholes, geniuses!
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Maybe it's just invisible or "see through"... water, as the Bible says.

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Good answer as it is _almost_ "not there" -

similar in some respects to neutrinos, which can and do pass through ordinary matter like it is not even there! ...


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