Question 1

Question

Question 2
Question 3
A) How do emission and reflection nebulae differ? (1 point)
interactions with light
contain remnants of stars
hard line edges
the presence of young stars
To form a nebula, pulls matter together or causes .
A) Select the correct answer from the list. (1 point)
Select Answer Select Answer
Astronomers think that most galaxies are centered by a , which exerts
that binds the galaxy together.
A) Select the correct answer from the list. (1 point)
Select Answer Select Answer
Question
4
Question
5
A)
Which statement best describes the galaxies closest to the Milky Way?
(1 point)
These galaxies are all identified as spiral.
These galaxies consist of mostly old stars.
These galaxies include irregular, spiral, and elliptical types.
These galaxies are independent of and unaffected by the Milky Way's gravitational pull.
A)
Which description best summarizes the steps that take place during black hole formation, in thecorrect order?
(1 point)
A small star gains mass through fusion reactions; core of star collapses; increased radiation triggers
a supernova.
Supernova triggers fusion reactions; massive star implodes due to extreme radiation; volume and
mass of star increase rapidly.
Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects
of gravity.
A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star
collapses.
Question
6
Question
7
A)
Where could scientists look to observe a black hole?
(1 point)
the edge of the solar system
the solar system asteroid belt
the center of the Milky Way
the center of the sun
A)
What is the main challenge astronomers face when trying to directly detect black holes?
(1 point)
Black holes are empty.
Black holes are too black.
Black holes are too small.
Black holes trap all light.
Question
8
A)
Which of these characteristics of a star make it most likely to become a black hole? Select thetwo correct answers.
(1 point)
It has an abundant supply of hydrogen.
It is dying.
Its mass is equal to that of the sun.
Its mass is greater than 20 times the mass of the sun.

Answer 1

Here are the answers to your questions:

1. Emission and reflection nebulae differ by:

   • The presence of young stars.

2. To form a nebula, pulls matter together or causes:

   • Gravity.

3. Astronomers think that most galaxies are centered by a:

   • Supermassive black hole.

4. Which statement best describes the galaxies closest to the Milky Way?

   • These galaxies include irregular, spiral, and elliptical types.

5. Which description best summarizes the steps that take place during black hole formation, in the correct order?

   • A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses.

6. Where could scientists look to observe a black hole?

   • The center of the Milky Way.

7. What is the main challenge astronomers face when trying to directly detect black holes?

   • Black holes trap all light.

8. Which of these characteristics of a star make it most likely to become a black hole? Select the two correct answers.

   • It is dying.
   • Its mass is greater than 20 times the mass of the sun.

If you have any more questions or need further assistance, feel free to ask!