# dark-matter's questions - English 1answer

528 dark-matter questions.

### 2 How do we know that galaxies are not in the process of flying apart?

2 answers, 52 views dark-matter galaxies
A major reason for believing in the existence of dark matter is that the stars in the outer regions of galaxies are moving too fast to remain bound to their galaxies, given only the estimated mass of ...

### -2 Can black holes effect light or just what the light reflects off of [on hold]

1 answers, 46 views particle-physics dark-matter
Can light be shifted or stopped by anything other than a solid? I ask because when observing black holes you can see light funneling into the sphere. My thought was that if what’s being pulled into ...

### Could dark matter/dark energy turn out to be tachyonic?

Today, I was watching the Inexplicable Universe with Neil deGrasse Tyson. He spoke about Dark Matter, Dark Energy, and then he spoke about Tachyons. Naively, I thought what if the reason we can't ...

### 27 Why is Anti-helium so important in the search for dark matter?

I've been reading/hearing that if the AMS satellite measures a significant flux of anti-helium in cosmic rays, that would be an irrefutable proof of dark matter. I was wondering: Why is that? what is ...

### 2 Where/how to learn about dark matter?

I am a physics student and as far as I know dark matter is beyond the topics included in my grade career. Are there any serious book on the subject? Any serious set of lectures somewhere in Internet?

### 16 How did we 'discover' dark matter? [closed]

I'm an astrophysics student and I've been researching this topic and there is one point that keeps eluding me. How did the scientific community realize that there had to be dark matter in the ...

### -1 Dark matter vs gravity compression [closed]

The problem of the universe not fully forming without Using the Dark Matter lamda fix may be explained by this thought experiment. The thought of space time compressing smaller and smaller if we ran ...

### -1 What models do physicists use in predicting the movement of stars in a galaxy that has lead to a wide-spread conviction that Dark Matter exists?

My (possibly poor) understanding of the argument for Dark Matter's existence is that stars in a large galaxy move more slowly than "they should" (presumably due to either some simplified model of the ...

### -3 On the Origin of Dark Energy and the Destination of Information Absorbed into Black Holes [closed]

This isn't a question as such, but I would like to present to you my theory which may solve some of the great mysteries of the universe. This is my first post, am I allowed to link here? I am eager ...

### Relationship between the orbital velocity of a satellite galaxy and its orbital distance

Does a satellite galaxy’s orbital velocity decrease with distance from the large galaxy, (similar to planets orbiting a star), or do they orbit faster than expected without invoking dark matter (...

### Alternative to the explanation of large scales phenomena [duplicate]

I've been reading a lot trough different articles about dark-matter and dark-energy and how they could explain observations such as the acceleration of the expansion of the universe or the ...

### 4 Could M-Theory explain dark matter as well as dark energy?

1 answers, 3.199 views string-theory dark-matter dark-energy
Is it possible that M-Theory provides a solution to the mystery of dark matter and dark energy? The idea of dark matter and dark energy is that there is some inexplicable source affecting our ...

### is Dark Matter really dead? (March 2018 news)

1 answers, 141 views gravity dark-matter
I watched a YouTube post on a channel that normally has solid information about astronomy (as far as I can tell). But this episode states that (emphasis mine) …talking about the controversial ...

### 4 Does Dark Matter Exert The Same Gravitational Force As Ordinary Matter?

4 answers, 607 views gravity dark-matter modified-gravity
I have read through this Wikipedia article on Dark Matter and it contains references to the methods used to demonstrate the existence of dark matter. A galaxy rotation curve is a plot of the ...

### 2 Is dark matter needed to explain the orbit of a satellite galaxy around its main galaxy?

1 answers, 79 views newtonian-gravity dark-matter
Do we need to invoke the existence of dark matter to explain the orbital distance of a sample satellite galaxy? Or is the observed visible matter enough to be able to justify the gravitational ...

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

0 answers, 32 views cosmology dark-matter
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 ...

### How could we detect a dark matter particle?

If dark matter only interacts via gravity, how is detection of a dark matter particle proposed? Don't current particle detectors rely on the other (non-gravitational) interactions?

### 12 If our galaxy's dark matter halo is so large and diffuse, why is the ordinary matter in it so much more localised and compactly located?

I just read that our galaxy's dark matter halo is estimated to be 1.5m ly across, compared to the visible galaxy's 100k ly across, needed to explain stellar rotation curves. Why would this be? By ...

### Does the virial theorem prohibit dark matter BH's on any size or timescale, or just make them very unlikely?

I've read other Q's on dark matter/black holes, but none seem to be technically specific enough to clarify this point. I understand so far, that because classic CDM doesn't interact in ways that ...