Galaxies In Dark Matter

[Cyberia]

According to Merriam Webster: (dark energy is) a hypothetical form of energy that produces a force that opposes gravity and is thought to be the cause of the accelerating expansion of the universe.

 

Dark energy helps space expand according to theory.

 

Evidence that space can expand is......missing.

Evidence that space is anything more than the distance between two objects is.....missing.

 

We accept that heat, magnetism, etc travels through space yet when it comes to gravity, oh, it warps space. Evidence of this is like my lucky charm that keeps blue elephants away. Proof that it works is that there are no blue elephants on Earth.

 

And of course we have no evidence that dark energy actually exists.

[maddog]

... And of course we have no evidence that dark energy actually exists.

Actually we have some evidence from models that are derived from observations. The weight of

this evidence however is kinda' like the validity of the evidence that retrograde motion of planets

can be explained by epicycles as per the Ptolemaic form of Astronomy. It has not risen to

the level of independent verification. Odd too is that expansion of Dark Energy is also

on the order of the same value that Einstein invented his expansion factor.

 

maddog

Edited February 25, 2012 by maddog

[Maximilium]

Hello peps, first post on this forums. I have been thinking a lot about Dark Matter / Dark Energy

and something click inside my head, and If i don't let it out it may explode.

 

Dark Matter:

The reason why the theory is on the table has to do to the fact that Galaxies rotation does not behave as predicted, like on a Solar System

for example, where planets close to the Sun orbit is fast, and planets like Neptune orbits slow around the Sun. In a Galaxy, everything orbits

around the center at the same speed.

 

So to make sense, Dark Matter was added to the evacuation. It cant be seen, but it can be detected ( Gravitational lensing )

 

Once I learn that gravitational lensing was used to detect Dark Matter,

I realized there could be another reason for this abnormality.

 

What if..... the reason Galaxies seem to rotate at the same speed is an illusion caused by Super Massive Black Holes in the center of the Galaxies slowing down

Time ( Time = Measurement of movement ).

 

It was Einstein's general theory of relativity that was the base to understand black holes. Where gravity affects time.

The more mass an object has, the more it can slow down time.

 

I think Super Massive Black holes in the center of Galaxies are slowing down time ( movement ) in the center of galaxies,

but the effect does not extend all the way trough the Galaxy , so the center that should be moving fast... moves slow, but the rest of the Galaxy rotates at normal speed, making the illusion

that the Galaxy is rotating at the same speed. This super Gravitational field on the center of each Galaxy should be detected by gravitational lensing.

Edited February 26, 2012 by Eniac

[sigurdV]

 

What if..... the reason Galaxies seem to rotate at the same speed is an illusion caused by Super Massive Black Holes in the center of the Galaxies slowing down

Time ( Time = Measurement of movement ).

 

This super Gravitational field on the center of each Galaxy should be detected by gravitational lensing.

 

I like the thought...its new!

 

Let scientific treatment begin :)

[Maximilium]

I like the thought...its new!

 

Thanks. :)

[jchardy929]

If "Dark Matter" really exists, shouldn't there be some close by? For example, inside our Solar System. After all, the Solar System is part of the Universe. So if the Universe contains Dark Matter, shouldn't there be some of it within our System? Then we could observe it in detail, and study its properties.

 

But Dark Matter seems to be too far away to study properly, and find out if it's really there. That's convenient for theorists, because they can't get proved wrong.

 

Doesn't that suggest, that the theorists have no idea what's going on, and have just made "Dark Matter" up?

My understanding is that ALL ordinary matter in the (our) universe is imbedded IN dark matter and affected by dark energy. Dark matter, therefore, MUST surround us all and permeate us in the same general way as neutrinos. It's also a major source of gravitational interaction and may explain why we have difficulty in defining the weakest of forces (gravity) and difficulty defining the elusive Higgs. Am I incorrect? JCH

[jchardy929]

Hello peps, first post on this forums. I have been thinking a lot about Dark Matter / Dark Energy

and something click inside my head, and If i don't let it out it may explode.

 

Dark Matter:

The reason why the theory is on the table has to do to the fact that Galaxies rotation does not behave as predicted, like on a Solar System

for example, where planets close to the Sun orbit is fast, and planets like Neptune orbits slow around the Sun. In a Galaxy, everything orbits

around the center at the same speed.

 

So to make sense, Dark Matter was added to the evacuation. It cant be seen, but it can be detected ( Gravitational lensing )

 

Once I learn that gravitational lensing was used to detect Dark Matter,

I realized there could be another reason for this abnormality.

 

What if..... the reason Galaxies seem to rotate at the same speed is an illusion caused by Super Massive Black Holes in the center of the Galaxies slowing down

Time ( Time = Measurement of movement ).

 

It was Einstein's general theory of relativity that was the base to understand black holes. Where gravity affects time.

The more mass an object has, the more it can slow down time.

 

I think Super Massive Black holes in the center of Galaxies are slowing down time ( movement ) in the center of galaxies,

but the effect does not extend all the way trough the Galaxy , so the center that should be moving fast... moves slow, but the rest of the Galaxy rotates at normal speed, making the illusion

that the Galaxy is rotating at the same speed. This super Gravitational field on the center of each Galaxy should be detected by gravitational lensing.

JCH here: But it is my understanding that --- though the arms and peripheral star systems are rotating at the SAME rate of speed from relatively centrally to the periphery, giving the rotational period the same for the entire galaxy; AT the area of the super massive -- the stars there ARE rotating about the core at a much higher rate of speed since they DO obey the Newton - Einstein concepts of gravity as would be expected. I.e.: There is a disconnect of the galactic core from the galaxy as a whole when it comes to rotational rates is there not?

[silas]

Dark matter is the same as mideval concept of aether, a tenous substance that is the universe. The famous MIchelson MOrley experiment disproved the existence of aether in the early 20th century. Come to think of it the apparatus used(the interferometer)was not advanced enough to detect such a tenous substance. The experiment banked on the speed of the earth revolving around the sun. The speed is very high but not nearly the speed of light.

 

In modern times the more sensitive apparatus (hubble telescope) detected aether in space inadvertently. It is intriguing because it did so by measuring the temperature of the universe around 3Kelvin when warm. This is the fabric of the universe. To convert it into dense everyday matter takes a lot of energy and one of the by products should be a black hole. That is why for every galaxy, a black hole, conservation of energy and matter.

[GASHOLE]

This matter is indeed dark

[Lancewen]

This matter is indeed dark

 

This topic does lend itself to a great deal of unsupported speculation. I like speculation as long as it doesn't stretch what I already know to far out of wack.

 

Most of us that post in a science forum like to read and watch science fiction and in some cases SF predicts the future. One concept I kind of like is (subspace) whatever that means. If it exist, maybe it's a good place for dark matter to be hiding from us.

[Maximilium]

the stars there ARE rotating about the core at a much higher rate of speed since they DO obey the Newton - Einstein concepts of gravity as would be expected.

 

 

But when You look back to Newton Law of Gravity, everything had an explanation... except the orbit of Mercury, it was Einstein special theory of relativity that was

able to explain the perihelion precession of Mercury

 

The paradox about Dark matter is quite simple:

 

1) It has mass.

2) It affect the rotational speeds of galaxies.

3) It can create gravitational lensing.... ( Its capable to bend space-time )

 

But no one cant see it, feel it, smell it or even taste it.

 

There are much more things to learn and discover about the Universe, it may take years to fully understand how everything works, but theories like Dark matter or Dark energy

feel more like an easy answer to a complicated question.

 

 

For example...

 

Dark energy...

The hypothetical form of energy that permeates all of space and tends to accelerate the expansion of the universe.

 

So... because Galaxies are accelerating away from each other, there must be some kind of energy making them to go faster....

.... what if the Universe is not being push.... what if the Universe is being pull on every direction by the void before its creation.

Edited March 23, 2012 by Eniac

[Lancewen]

Dark energy...

The hypothetical form of energy that permeates all of space and tends to accelerate the expansion of the universe.

 

So... because Galaxies are accelerating away from each other, there must be some kind of energy making them to go faster....

.... what if the Universe is not being push.... what if the Universe is being pull on every direction by the void before its creation.

 

That's an interesting concept. Can you elaborate a little about what might be causing this pull you are talking about? I find it hard to believe that a void or a total nothingness could be causing it.

[Maximilium]

That's an interesting concept. Can you elaborate a little about what might be causing this pull you are talking about?

 

O.K I try, but first I need to put some information on the table:

 

1) Space is something:

Based on the "The Fabric of the Cosmos" by physicist Brian Greene, Space has properties that can not

be ignored.... It can stretch, twist, warp, and ripple under the influence of gravity.

 

Albert Einstein general relativity

His equations of general relativity predict a number of phenomena, many of which have been confirmed:

 

-bending of light around massive objects (gravitational lensing)

-a slow evolution in the orbit of the planet Mercury (perihelion precession)

-frame dragging of space-time around rotating bodies

-weakening of light escaping gravity's pull (gravitational redshift)

- speeding up in the rotational periods of binary stars and pulsars

-gravitational waves (ripples in space-time fabric) caused by cosmic smashups

-the existence of black holes that trap everything including light

 

2)The existence of Voids & Super-voids:

 

-Cosmic voids, and supervoids, are large volumes of space that are devoid of matter.

This link has some of the latest information on cosmic voids.

 

3) Stephen Hawking: Story of Everything

 

An event called the big bang.

But I'm afraid we have to stop a moment before w carried away by fire and noise, at the very beginning the big bang actually happened in total drkness because light didn't exist yet.

To see it, we would have needed some kind of cosmic night vision.

But even this, a view from the outside is impossible.

Again, it sounds strange, but space didn't exist then either.

So there was no outside.

The only place there was was inside.

This early universe was a very strange thing indeed.

There is still much I would love to know about it, but standard concepts of time or space don't really apply.

It was just a very tiny ultra hot fog of energy.

Then it expanded.

With a tremendo flash of radiation.

From smaller than an atom to about the size of an orange in LESS THAN A TRILLIONth OF A Second.

Almost no time at all.

The universe simply inflated into existence.

 

 

 

Stephen Hawking

 

 

 

 

 

 

So to answer to Your question:

 

Space didn't exist before the Big Bang, It was created with the big bang.

What existed before the big bang? It's still an open question.

 

What if before the Big Bang there was nothing, just a empty infinite void.

And then the Big Bang happen, The expansion of the universe began.

 

If this empty infinite void before the Big Bang exist, then it could be that is acting like a vacuum, pulling the

Universe ( and SPACE ) in every direction..... since there is no resistance, there is no deceleration........

Since all the matter / energy / space was created in the big bang event, and the Universe still expanding, then eventually voids

or super-voids will begin to fill the gaps caused by this vacuum effect pulling the universe apart.

Edited March 25, 2012 by Eniac