A rudementary question on dark matter

[hms.tech]

I think that there is mass associated with all dark matter in the universe and this mass is much greater than the total mass of the stars in a particular galaxy.

Now, if I were to classify the mass into two categories :
1. visible
2. invisible

How would I carry that out ?

Is dark matter invisible mass or would it be counted as visible mass ?

 

[hms.tech]

let me rephrase that, is dark matter visible to the eye ?

Does it emit e.m radiation in the visible region of the spectrum ?

 

[94JZA80]

let me rephrase that, is dark matter visible to the eye ?

Does it emit e.m radiation in the visible region of the spectrum ?

"dark matter" does not emit radiation in the visible region or any other region of the EM spectrum...otherwise we would be able to detect it, and not just theorize its existence. the best evidence of the existence of dark matter is indirect - that is, we can't detect dark matter directly, but we can see its effects on ordinary matter. take spiral galaxies for instance - surely their inner regions orbit their respective galactic centers faster than their outer regions...and yet the outer regions still appear to orbit their respective galactic centers much faster than their detectable masses suggest. and so some scientists theorize that there is a substantial amount of "dark matter" in those outer regions (that cannot be seen by any ordinary means of detection) that provide the additional gravity necessary to account for the faster-than-predicted orbits of the outer regions of spiral galaxies about their respective galactic centers.

so your hypothesis that there is mass associated w/ dark matter is in line w/ dark matter theory, b/c even though it does not radiate anywhere in the EM spectrum, its gravitational effects can be detected.

 

[SpaceDreamer]

The existence and location of dark matter can be inferred by gravitational lensing. It is one of the best ways we have to locate it but even then it's not easy. I do remember a team of astronomers created a map of the dark matter, if I find it ill link it. However dark matter is still classified as invisible matter in your question. Visible matter are things like planets, stars, galaxies, etc. Dark matter is its own form of matter and does have mass and it is predicted to be much larger than the mass of what we can see.

 

[pmacias]

I would like to clarify that the concept of dark matter is still a subject of ongoing research and there is no definitive answer to your question at this time. However, based on current understanding and evidence, dark matter is considered to be invisible mass. This means that it does not interact with light or other forms of electromagnetic radiation, making it difficult to detect using traditional observational methods. Therefore, it would not be counted as visible mass.

To classify mass into visible and invisible categories, we would need to consider the different properties and characteristics of matter. Visible mass refers to the matter that can be directly observed through its interaction with light, such as stars, planets, and other celestial objects. On the other hand, invisible mass, also known as dark matter, is inferred through its gravitational effects on visible matter.

To accurately carry out this classification, we would need to use various observational and theoretical techniques, such as measuring the rotation curves of galaxies, studying the dynamics of galaxy clusters, and looking for distortions in the light from distant galaxies. These methods can help us identify the presence and distribution of dark matter in the universe.

Overall, dark matter is considered to be invisible mass, and it would not be counted as visible mass in the classification process. However, further research and advancements in technology may provide us with a better understanding of dark matter and its properties in the future.