Linked Questions

23
votes
2answers
8k views

How do we know Dark Matter is non-baryonic? [duplicate]

It seems widely stated, but not thoroughly explained, that Dark Matter is not normal matter as we understand it. Wikipedia states "Consistency with other observations indicates that the vast majority ...
2
votes
2answers
1k views

Why can't dark matter be baryonic? [duplicate]

Here's what I know about dark matter: Astrophysicists realized the movements of galaxies and other astronomical bodies cannot be explained by the gravitational effects of matter known to be there, so ...
1
vote
1answer
327 views

What is dark matter composed of? [duplicate]

They say that about 80% of the matter in the universe is dark matter -- some unknown substance that has mass. But what is this matter expected or speculated to be composed of? For example might it ...
2
votes
2answers
166 views

Relation between baryonic mass and luminosity [duplicate]

I have one simple question: How do we know that dark matter is not just ordinary matter which is simply not luminous? For example if we would take a black rock and put it somewhere in the universe, ...
4
votes
0answers
232 views

Why is “dark matter” a more parsimonious explanation than “more normal matter than we thought”? [duplicate]

Possible Duplicate: Why isn't dark matter just matter ? The evidence usually presented in support of dark matter is larger-than-expected masses in galaxy clusters: the mass required for the ...
0
votes
1answer
71 views

Where is the mass and gravitational influence of dark matter? [duplicate]

I'll have to ask an elementary level question about orbital motion and the mass/gravity that influences it. In solar systems, the large mass of the sun pulls on the planets and we see the velocity of ...
1
vote
0answers
53 views

Elementary particles and halo of matter - rookie question [duplicate]

I'm super new to this Stack and even newer to physics. To be honest, I am currently reading an introductory book on physics called "Seven brief lessons of physics" by Carlo Rovelli (the very first ...
1
vote
0answers
48 views

Does dark matter / dark energy could be simply regular mattter [duplicate]

First of all I'm not a physist, my formation is related to Information Systems but I was always curious regarding the laws that rules our universe. I would like to apologize as well for my bad ...
0
votes
0answers
35 views

How have protons and neutrons been scientifically eliminated as candidates for Dark Matter? [duplicate]

I know most scientists, if not all scientists, believe Dark Matter cannot be accounted for by baryonic matter. And I don't mean baryonic matter that is unseen because it is not emitting light, I mean ...
11
votes
10answers
17k views

Does anything exist in the intergalactic space?

I am a part time physics enthusiast and I seldom wonder about the intergalactic space. First, it is my perception that all(almost all) the objects in the universe are organized in the forms of ...
12
votes
3answers
1k views

What exactly is 'Dark Matter'? [duplicate]

There are many documentaries, forums, blogs and more dedicated to Dark Matter. I have been frantically searching for an answer to my question however none of my sources have clarity to the matter of ...
3
votes
2answers
1k views

Dark matter and dark energy [duplicate]

Possible Duplicate: Dark matter references I have recently read about dark matter and dark energy, and why physicists think it must exist (dark matter: mass of galaxies are far bigger than ...
-2
votes
2answers
554 views

Why is dark matter the best theory available to explain missing mass problems?

Why is dark matter the best theory to explain the missing mass problem? Why is dark matter mathematically necessary to explain the missing mass problem? On a side not I believe dark matter is ...
4
votes
2answers
532 views

Can dark matter be relativistic dust?

As far as I know the mass of an observed object increases as it approaches the speed of light. Is it possible that the excess mass called "dark matter" is due to relativistic dust? Surely, stars ...
8
votes
1answer
2k views

Can Dark Matter just be clumps of Neutrons

I was wondering about Dark matter, and it occurred to me that why could it not be just nuclei of Neutrons with no electron cloud. Is it possible for such things to exists. Can Neutrons bond to one ...

15 30 50 per page