Difference between dark energy and dark matter

[Apashanka]

From the rotation curve of spiral galaxy it is found that the entire mass is not concentrated at the centre but for large distance from the central core it varies linearly with r for which the velocities(rotational) of the objects far from the central core remains nearly constt. and near to the central core (within) it increases linearly.
Is it not related to dark energy since this mass(>>r) is which we can't accept and leads to dark energy??

 

[PeterDonis]

Is it not related to dark energy

No, it's related to dark matter. Dark matter is not the same thing as dark energy.

this mass(>>r) is which we can't accept

Huh? Cosmologists have no trouble accepting that dark matter exists.

 

[Apashanka]

No, it's related to dark matter. Dark matter is not the same thing as dark energy.

Can you please explain how are they different

 

[PeroK]

Can you please explain how are they different

Things are different when they are not the same.

 

[PeterDonis]

Can you please explain how are they different

Have you tried finding what cosmologists have to say about each of them?

 

[mathman]

Dark matter is stuff which accounts for the behavior of stars away from the centers of galaxies, among other things.
Dark energy is a completely different thing(?) which serves as an explanation of why the expansion of the universe is accelerating.

 

[kimbyd]

Can you please explain how are they different

So, please be aware that you're getting the response you're getting because this question is asked so often, and it would be easy for you to find the answer yourself by just looking up the terms.

You're much more likely to get good responses if you look up the info then come back here and ask questions about the things you had a hard time understanding.