Difference between dark energy and dark matter

In summary, dark energy and dark matter are two separate concepts in cosmology. Dark matter is the invisible substance that explains the behavior of stars within galaxies, while dark energy is a force that is believed to be responsible for the accelerating expansion of the universe. It is recommended to research these terms separately for a better understanding of their differences.
  • #1
Apashanka
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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??
 
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  • #2
Apashanka said:
Is it not related to dark energy

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

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

Huh? Cosmologists have no trouble accepting that dark matter exists.
 
  • #3
PeterDonis said:
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
 
  • #4
Apashanka said:
Can you please explain how are they different

Things are different when they are not the same.
 
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  • #5
Apashanka said:
Can you please explain how are they different

Have you tried finding what cosmologists have to say about each of them?
 
  • #6
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.
 
  • #7
Apashanka said:
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.
 

Related to Difference between dark energy and dark matter

1. What is the difference between dark energy and dark matter?

Dark energy and dark matter are two distinct components of the universe that have very different properties and effects on the universe. Dark energy is a hypothetical form of energy that is thought to be responsible for the accelerating expansion of the universe, while dark matter is a type of matter that does not interact with light and is thought to make up a large portion of the total matter in the universe.

2. How do we know that dark energy and dark matter exist?

Scientists have observed the effects of dark energy and dark matter through various astronomical observations and experiments. The most compelling evidence for dark energy comes from observations of the accelerating expansion of the universe, while the existence of dark matter is supported by the gravitational effects it has on visible matter in galaxies and galaxy clusters.

3. What are the properties of dark energy and dark matter?

Dark energy is believed to have a negative pressure, which is responsible for the expansion of the universe. It is also thought to be evenly distributed throughout the universe. On the other hand, dark matter is believed to have a gravitational pull on visible matter, but does not interact with light. It is also thought to be clumped together in halos around galaxies.

4. Can we see or detect dark energy and dark matter?

No, dark energy and dark matter cannot be directly observed or detected with current technology. They do not interact with light, making them invisible to telescopes. However, scientists can infer their existence through their effects on visible matter and the expansion of the universe.

5. Are there any theories about the origins of dark energy and dark matter?

There are several theories about the origins of dark energy and dark matter, but they are still largely unknown. Some theories suggest that dark energy is a property of space itself, while others propose the existence of a new type of particle for dark matter. Further research and observations are needed to fully understand the origins of these mysterious components of the universe.

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