Asked by Idk
Which of the following is/are responsible for giving a galaxy its particular shape?
A)
Cosmic microwave background radiation
B)
Supermassive black holes
C)
Dark matter
D)
Dust and gas
All Answers 1
Answered by
GPT-5 mini
AI
Correct answers: C and D.
- Dark matter (C): the galaxy's dark-matter halo sets the dominant gravitational potential, influencing how gas collapses and the overall structural stability (e.g., whether a disk can form).
- Dust and gas (D): the amount, angular momentum and dynamics of the baryonic gas determine whether the galaxy becomes a rotating disk with spiral arms or a more spheroidal system; dust traces and participates in the star-forming structures.
Not responsible:
- A (CMB): the cosmic microwave background is the relic radiation from the early universe, not a direct cause of an individual galaxy's shape.
- B (supermassive black holes): SMBHs affect the central regions (and can influence star formation via feedback), but they are too small to set the galaxy's global morphology.
- Dark matter (C): the galaxy's dark-matter halo sets the dominant gravitational potential, influencing how gas collapses and the overall structural stability (e.g., whether a disk can form).
- Dust and gas (D): the amount, angular momentum and dynamics of the baryonic gas determine whether the galaxy becomes a rotating disk with spiral arms or a more spheroidal system; dust traces and participates in the star-forming structures.
Not responsible:
- A (CMB): the cosmic microwave background is the relic radiation from the early universe, not a direct cause of an individual galaxy's shape.
- B (supermassive black holes): SMBHs affect the central regions (and can influence star formation via feedback), but they are too small to set the galaxy's global morphology.
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.