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Old 07-07-2018, 03:19 PM   #44
O_P_T
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Quote:
Originally Posted by chevss454 View Post
Excellent description in an easy to understand way. Thank you, Baron.


Now could you explain dark matter, which I find fascinating, and its relationship to matter, gravity and radiation please?
Regarding Dark Matter, it has to do with Astronomical observations.

I'm going from memory here, so forgive me if I frack up a detail or two.

There are various observations that suggest that 90+% of the matter/energy in the Universe isn't directly observed. That is we don't "see" it.

All we observe are the stars and gas clouds that radiate in various parts of the electromagnetic spectrum. i.e., light, infrared, x-ray, ultraviolet, etc.

There are two basic observations that suggest there is something "else".

The first is the rotational velocity of galaxy's.

They rotate much the same way a phonograph does. i.e., the same rpm.

Since the vast majority of the observable mass of a galaxy is located a very thin "disk" region, they should not move like this.

Think about the various planets in our solar system, they move at their own rpm, and that makes sense, because unlike a phonograph, they are not linked together.

So why do these stars not behave like planets as they revolve around the center of the galaxy?

What could make them do that?

The most logical one is the force of gravity since it can work at those ranges.

Electromagnetism works at long ranges as well, but since it can attract or repel depending on the charge or magnetic pole involved, it gets a whole lot more complicated to explain that.

Gravity simply attracts, so it's easier to work out the math.

For gravity to be the cause of the constant rpm, there must be a spherical distribution of mass around the center of the galaxy, and it must be much much more mass than what we do observe.

Since we don't "see" it it's called "dark matter".

The other set of observations have to do with the expansion of the Universe.

From what is now observed, and what it is thought to mean, we can't explain the observed rate of expansion without some form of dark matter/energy.

Again, it is "dark" because we can't directly observe it, except on it's proposed effect on what we do observe.
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