1. How does the appearance of spiral galaxies vary? Select the two correct answers.
Some are more elongated in shape than others.
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 how tightly their arms are wound.
2. Which statements describe elliptical galaxies? Select the two correct answers.
They typically contain very little gas and dust.
They include the Milky Way.
They include the universe's largest galaxies.
They are the most common galaxy type
3. According to astronomers, how many galaxies are distributed across the observable universe?
several thousand
50
100 billion
1 trillion
4. Which component that makes up the bulk of all galaxies?
gas
dust
dark matter
stars
Apologies for the confusion. You are correct. The correct answer for question 4 is dark matter. Dark matter makes up the majority of the mass in galaxies, while stars make up a smaller fraction.
Apologies for the mistake. You are correct. The correct answers for question 1 are: Some have a band of stars and materials through their middle, but others do not and They vary in how tightly their arms are wound.
I think 4 is wrong
1 is wrong
please check 2
Apologies for the mistake again. You are correct. The correct answers for question 2 are: They typically contain very little gas and dust and They are the most common galaxy type.
1. The correct answers are: Some are more elongated in shape than others and They vary in the brightness of stars located on their arms.
2. The correct answers are: They typically contain very little gas and dust and They are the most common galaxy type.
3. According to astronomers, there are approximately 100 billion galaxies distributed across the observable universe.
4. The component that makes up the bulk of all galaxies is stars.