Mass of a galaxy without dark matter and with dark matter

In summary, without dark matter, a galaxy would not exist. However, the mass of a galaxy does not change much when dark matter is included.
  • #36
officialmanojsh said:
There are many Theories which define the start of universe differently. 1 among them say that universe begin with the break down of black holes and would end when entire mass of universe is pulled back by black hole. Yet the reality is undiscovered :)
I am not aware of mainstream theories suggesting that. Please give a source for that claim.
 
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  • #38
That is a news article, I was asking for a peer-reviewed publication (see our forum rules). News articles nearly always get the science wrong. The preprint linked there is not peer-reviewed, and it does not describe what you wrote in your previous post.
 
<h2>1. What is the difference between the mass of a galaxy with and without dark matter?</h2><p>The mass of a galaxy with dark matter is significantly higher than the mass of a galaxy without dark matter. Dark matter is estimated to make up about 85% of the total mass of a galaxy, while the remaining 15% is made up of visible matter such as stars, gas, and dust.</p><h2>2. How do scientists determine the mass of a galaxy?</h2><p>Scientists use a variety of methods to determine the mass of a galaxy, including measuring the orbital speeds of stars and gas, analyzing the gravitational lensing effect, and studying the rotation curves of galaxies.</p><h2>3. Can dark matter be directly observed?</h2><p>No, dark matter cannot be directly observed because it does not interact with light. However, its presence can be inferred through its gravitational effects on visible matter.</p><h2>4. Why is dark matter important in understanding the structure of galaxies?</h2><p>Dark matter plays a crucial role in the formation and evolution of galaxies. Its gravitational pull allows galaxies to form and hold their shape, and it also affects the distribution of visible matter within a galaxy.</p><h2>5. Are there any theories that can explain the nature of dark matter?</h2><p>There are several theories that attempt to explain the nature of dark matter, including the WIMP (Weakly Interacting Massive Particles) theory and the MACHO (Massive Compact Halo Objects) theory. However, the exact nature of dark matter is still a mystery and continues to be a subject of ongoing research and debate in the scientific community.</p>

1. What is the difference between the mass of a galaxy with and without dark matter?

The mass of a galaxy with dark matter is significantly higher than the mass of a galaxy without dark matter. Dark matter is estimated to make up about 85% of the total mass of a galaxy, while the remaining 15% is made up of visible matter such as stars, gas, and dust.

2. How do scientists determine the mass of a galaxy?

Scientists use a variety of methods to determine the mass of a galaxy, including measuring the orbital speeds of stars and gas, analyzing the gravitational lensing effect, and studying the rotation curves of galaxies.

3. Can dark matter be directly observed?

No, dark matter cannot be directly observed because it does not interact with light. However, its presence can be inferred through its gravitational effects on visible matter.

4. Why is dark matter important in understanding the structure of galaxies?

Dark matter plays a crucial role in the formation and evolution of galaxies. Its gravitational pull allows galaxies to form and hold their shape, and it also affects the distribution of visible matter within a galaxy.

5. Are there any theories that can explain the nature of dark matter?

There are several theories that attempt to explain the nature of dark matter, including the WIMP (Weakly Interacting Massive Particles) theory and the MACHO (Massive Compact Halo Objects) theory. However, the exact nature of dark matter is still a mystery and continues to be a subject of ongoing research and debate in the scientific community.

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