How does the appearance of spiral galaxies vary? Select the two correct answers.(1 point)
Responses
Some are more elongated in shape than others.
Some are more elongated in shape than others.
They vary in how tightly their arms are wound.
They vary in how tightly their arms are wound.
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.
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.
They vary in the brightness of stars located on their arms.
The correct answers are:
1. Some are more elongated in shape than others.
2. They vary in how tightly their arms are wound.
Explanation: Spiral galaxies can have different shapes, with some being more elongated than others. Additionally, the arms of spiral galaxies can vary in how tightly they are wound, which contributes to their overall appearance.
The correct answers are:
- Some are more elongated in shape than others.
- They vary in how tightly their arms are wound.
To determine the appearance variations of spiral galaxies, scientists observe and analyze their characteristics. One way to differentiate them is by their shape. Some spiral galaxies are more elongated in shape than others, meaning their overall structure appears more stretched out or flattened. This variation in shape can be due to different factors such as gravitational interactions with nearby galaxies.
Another characteristic that varies among spiral galaxies is how tightly their arms are wound. The arms of spiral galaxies are the bright, curved structures that extend from their central bulges. Some spiral galaxies have tightly wound arms, meaning they are closer together and more tightly coiled, while others have loosely wound arms, meaning they are more spread out and less tightly coiled. This difference in the tightness of the arms can be indicative of the rate at which stars are formed and the overall dynamics of the galaxy.
The other two response options mentioned—having a band of stars and materials through their middle, and varying brightness of stars on their arms—are not correct options for this question as they do not represent variations in the appearance of spiral galaxies.