How does the appearance of spiral galaxies vary? Select the two correct answers.(1 point) Responses They vary in how tightly their arms are wound. They vary in how tightly their arms are wound. They vary in the brightness of stars located on their arms. They vary in the brightness of stars located on their arms. Some have a band of stars and materials through their middle, but others do not. Some have a band of stars and materials through their middle, but others do not. Some are more elongated in shape than others.
The correct answers are:
1. They vary in how tightly their arms are wound.
2. Some have a band of stars and materials through their middle, but others do not.
The correct answers are:
1. They vary in how tightly their arms are wound.
2. Some have a band of stars and materials through their middle, but others do not.
To determine the correct answers, you can analyze the characteristics of different spiral galaxies. By observing and comparing multiple spiral galaxies, astronomers have discovered that their appearance varies in several ways.
Firstly, spiral galaxies can have arms that are tightly wound or loosely wrapped. This variation is due to differences in the gravitational interactions between stars and other celestial objects within the galaxy.
Secondly, some spiral galaxies possess a central region with a distinct band of stars and materials, while others lack this feature. This variation could be caused by different formation processes or interactions with neighboring galaxies.
On the other hand, the statement about the brightness of stars located on their arms is not a correct variation observed in spiral galaxies. Similarly, the statement about the elongation of the galaxies' shape is not specifically related to the appearance variation of spiral galaxies.
The correct answers are:
1. They vary in how tightly their arms are wound.
2. Some have a band of stars and materials through their middle, but others do not.