Dark matter can be described as matter that _______.
A. does not exert gravitational force but can be detected with light
B. exerts gravitational force and makes up most of the stars and planets
C. cannot be detected and does not emit or absorb light

Question

Dark matter can be described as matter that _______.
	A.	does not exert gravitational force but can be detected with light
	B.	exerts gravitational force and makes up most of the stars and planets
	C.	cannot be detected and does not emit or absorb light

anonymous · Answer

I think it's A

anonymous · Answer

k thnk u. :)

anonymous · Answer

The answer is C. Dark matter cannot be detected with light. If it is detected, its existence would be confirmed and it would not stay just as a hypothesized theory. It is also another reason why they call it dark.

anonymous · Answer

The only reason we think it exists is because it does exert gravitational force. It is the missing mass needed to explain the amount of gravitational force in galaxies, etc.

unklerhaukus · Answer

Dark matter has not been directly measure/detected

anonymous · Answer

None of the above. It would be B if the option was "exerts gravitational force and makes up most of the Universe"

unklerhaukus · Answer

I dont think we can speculate that dark matter makes up the stars and planets if it has not been observed

anonymous · Answer

Dark matter can be detected gravitationally - this is how we know it is there. One candidate for dark matter is planet like objects.

anonymous · Answer

The rotation curves of galaxies suggests that the dark matter is present.

unklerhaukus · Answer

It dark matter fills in gaps in the equations for rotating galaxies but that is not detection.
There is some doubt that the equations being used are perfect.

anonymous · Answer

In galaxy clusters, dark matter in the cluster accounts for some of the mass needed to create the gravitational lensing that we see. But again, that's not detecting it. It's just seeing the effects of it.

unklerhaukus · Answer

i dont really like A. B. or C.

anonymous · Answer

That is how things are detected - through their effects. I do agree though that little is known about what the dark matter is.

anonymous · Answer

Or dark matter doesn't exist and we need to come up with a new theory of gravity.

anonymous · Answer

Much less likely.

unklerhaukus · Answer

Keaplurin i like that answer better

anonymous · Answer

I like to stay open to all possibilities. Like Dark Energy ... maybe, again, a new theory of gravity would explain that also.

unklerhaukus · Answer

i hate the concept of have no chance of ever experiencing most of the universe , it seems like a weak argument to me

anonymous · Answer

I agree!

unklerhaukus · Answer

ill be  study this stuff this session at uni, i hope to understand it all better,

anonymous · Answer

I'm trying to keep learning about it also. Good luck in your studies.