<p>Yes, there is enough of these things, especially dark matter which is accelerating the expansion of the universe.</p>

CC BY-SA 4.0
2019-05-31T11:55:47.937Z
in regards to accelerating the expansion of the universe, I think you mean "dark energy" rather than dark matter.
uhoh
CC BY-SA 4.0
2019-05-31T12:18:57.383Z
The more mass there is,the more gravity should slow the expansion. It is said that dark energy is speeding up the expansion,but I can't understand where this energy is coming from. Matter & energy can neither be created nor destroyed.
Michael Walsby
CC BY-SA 4.0
2019-05-31T12:34:02.840Z
@MichaelWalsby Thing don't accelerate in their frame of reference, the geometry of the spacetime is changing on a way what makes them accelerating for us.
peterh
CC BY-SA 4.0
2019-05-31T12:42:43.193Z
If dark energy is not energy but a change in the geometry of spacetime,why call it energy?
Michael Walsby
CC BY-SA 4.0
2019-05-31T13:29:46.463Z
No,that wasn't what I was asking.
Michael Walsby
CC BY-SA 4.0
2019-05-31T11:37:04.833Z
2019-05-31T11:37:04.833Z
Parth Agarwal
<p>Are there enough neutrinos &amp; other invisible particles in a cubic light year of space to significantly affect the expansion of the universe,&amp; at a very rough estimate without taking into account WIMPS &amp; other exotic particles for which there is no firm evidence,what would be the total mass of this quantity of matter? Only a tiny proportion of all the neutrinos emitted since the Big Bang have been absorbed,the rest are still flying around in search of a home.</p>

CC BY-SA 4.0
2019-05-31T00:37:12.223Z
NB there **is** firm evidence for dark matter; it's just that we can't work out what it consists of.
Chappo Hasn't Forgotten
CC BY-SA 4.0
2019-05-31T06:41:57.020Z
I agree with you that there is good evidence for invisible mass;the question is what comprises it,what is it made of? There is no good evidence for WIMPs,though perhaps one day there might be. Meanwhile,I think we need to know how much matter there is in the form of knowjn particles whose existence is not in doubt.
Michael Walsby
CC BY-SA 4.0
2019-05-31T13:18:40.300Z
If you're asking "what might dark matter consist of?" then I suggest you adjust the wording of your question accordingly.
AtmosphericPrisonEscape
CC BY-SA 4.0
2019-05-31T13:32:32.203Z
No,that wasn't what I was asking.
Michael Walsby
<universe>
Invisible Mass Affecting the Expansion of the Universe
Michael Walsby
# Invisible Mass Affecting the Expansion of the Universe

(Asked by: username_0 on 2019-05-30)

Are there enough neutrinos & other invisible particles in a cubic light year of space to significantly affect the expansion of the universe,& at a very rough estimate without taking into account WIMPS & other exotic particles for which there is no firm evidence,what would be the total mass of this quantity of matter? Only a tiny proportion of all the neutrinos emitted since the Big Bang have been absorbed,the rest are still flying around in search of a home.

**Tags:** universe
> **Comments:**
> **username_1**: NB there **is** firm evidence for dark matter; it's just that we can't work out what it consists of.  
> **username_0**: I agree with you that there is good evidence for invisible mass;the question is what comprises it,what is it made of? There is no good evidence for WIMPs,though perhaps one day there might be. Meanwhile,I think we need to know how much matter there is in the form of knowjn particles whose existence is not in doubt.  
> **username_2**: If you're asking "what might dark matter consist of?" then I suggest you adjust the wording of your question accordingly.  
> **username_0**: No,that wasn't what I was asking.  

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## 1 answers

### Answer by username_3 on 2019-05-31. Score: -2

Yes, there is enough of these things, especially dark matter which is accelerating the expansion of the universe.

> **Comments:**
> **username_4**: in regards to accelerating the expansion of the universe, I think you mean "dark energy" rather than dark matter.  
> **username_0**: The more mass there is,the more gravity should slow the expansion. It is said that dark energy is speeding up the expansion,but I can't understand where this energy is coming from. Matter & energy can neither be created nor destroyed.  
> **username_5**: @MichaelWalsby Thing don't accelerate in their frame of reference, the geometry of the spacetime is changing on a way what makes them accelerating for us.  
> **username_0**: If dark energy is not energy but a change in the geometry of spacetime,why call it energy?  
> **username_0**: No,that wasn't what I was asking.  

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