Question

Help if good at earth science/ space pls!!

1.) Which proportion of the universe's galaxies can be seen from Earth?(1 point)

a, approximately 10 percent

b, nearly half

c, approximately 25 percent

d, far less than 1 percent




2.) The model of galaxy formation in which sections of gas clouds collapse into small pieces which repeatedly combine into larger pieces under the influence of gravity is called the ____ model or the ____ model?


3.) Why are most stars not destroyed in a galaxy collision?(1 point)

a) Galaxies are mostly empty space.

b) Galaxies don't have stars.

c) Galaxies move too slowly for that type of damage.

d) Gravity keeps them away from each other.



4.) The universe's galaxies have evolved since what point in time?(1 point)

a) 800 million years ago, when gas concentrations were optimal for galaxy formation

b) 13.8 billion years ago, right after the universe first formed

c) approximately 50 million years ago, after initial clumps of material were formed

d) 23.4 billion years ago, when the universe first formed

Answer 1

1. The universe's galaxies have evolved since what point in time?

2. Which proportion of the universe's galaxies can be seen from Earth?

3. Which was used to create the first image of a black hole?

4. Which of these describes a nebula?

5. Why are most stars not destroyed in a galaxy collision?

6. What do supernova remnant and planetary nebulae have in common? Select the three correct answers.

7. Which of the following is an accurate description of cosmic microwave background (CMB) radiation? Select the two correct answers.

8. Select the correct answers from the list.

The model of galaxy formation in which sections of gas clouds collapse into small pieces which repeatedly combine into larger pieces under the influence of gravity is called the ____ model or the ____ model.

9. Drag and drop the words into the correct locations. Answers may be used once, more than once, or not at all.

Galaxies can be grouped by the age of the stars they tend to contain, with ____ galaxies having the youngest stars and ____ galaxies having the oldest stars.

10. Which event triggers the start of black hole formation?

Step-by-step explanation:

1. 13.8 billion years ago, right after the universe first formed

2. far less than 1 percent

3. radio waves from matter at the edge of the black hole

4. cloud of gas and dust

5. Galaxies are mostly empty space.

6. They emit non-visible radiation.

They are composed of matter from dying stars.

They contribute matter to interstellar space.

7. CMB is uniformly distributed and of a uniform temperature across the universe.

CMB is remnant radiation from the Big Bang.

8. inside-out / bottom-up

9. irregular / elliptical

10. A massive star depletes its stores of hydrogen and helium