Which statements describe elliptical galaxies? Select the two correct answers.
A. They include the universe's largest galaxies
D. They typically contain very little gas and dust.
Which component that makes up the bulk of all galaxies?
B. Dark matter
According to astronomers, how many galaxies are distributed across the observable universe?
C. 100 billion
How does the appearance of spiral galaxies vary? Select the two correct answers
A. Some have a band of stars and materials through their middle, but others do not.
D. They vary in how tightly their arms are wound.
Thank you answer goddes
To answer the first question, which statements describe elliptical galaxies, we need to consider the options:
A. They include the universe's largest galaxies.
D. They typically contain very little gas and dust.
To find out which statements are correct, we can refer to scientific literature or astronomy resources. However, if we don't have access to such resources, we can make an educated guess based on general knowledge and logical reasoning.
Option A states that elliptical galaxies include the universe's largest galaxies. This statement is incorrect. While elliptical galaxies can be quite massive, they are not necessarily the largest galaxies in the universe. Spiral galaxies, such as the Milky Way, can also be very large.
Option D states that elliptical galaxies typically contain very little gas and dust. This statement is correct. Elliptical galaxies are composed mostly of older stars and have used up or expelled much of their interstellar gas and dust. Therefore, option D is a correct statement describing elliptical galaxies.
Now let's move on to the second question, which asks about the component that makes up the bulk of all galaxies:
B. Dark matter
To determine if this statement is correct, we need to understand the current understanding of galaxy composition. Astronomical observations and theories suggest that dark matter, a hypothetical form of matter that does not interact with light or electromagnetic radiation, makes up a significant portion of the total mass in galaxies. Therefore, option B is correct – dark matter is indeed a component that makes up the bulk of all galaxies.
For the next question, regarding the number of galaxies distributed across the observable universe:
C. 100 billion
To obtain an accurate answer, we can refer to scientific studies and observations. According to current estimates, there are approximately 100 billion galaxies in the observable universe. Therefore, option C is the correct answer.
Lastly, we have the question that asks about the variation in appearance of spiral galaxies:
A. Some have a band of stars and materials through their middle, but others do not.
D. They vary in how tightly their arms are wound.
To confirm the correct answers, we can examine images and descriptions of spiral galaxies. Option A is correct – some spiral galaxies have a central band of stars and materials known as a bar, while others do not. Option D is also correct – spiral galaxies exhibit a range of arm tightness, with some having tightly wound arms and others having more loosely wound arms.
It is worth noting that access to reliable scientific resources can provide more accurate and detailed answers to these questions.
The correct answers are:
1. D. They typically contain very little gas and dust.
2. B. Dark matter.
According to astronomers, the number of galaxies distributed across the observable universe is approximately 100 billion (C).
Regarding the appearance of spiral galaxies, the correct answers are:
1. A. Some have a band of stars and materials through their middle, but others do not.
2. D. They vary in how tightly their arms are wound.