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Select the correct answer from the list.(1 point) To form a nebula, Select Answer  pulls matter together or causes  Select Answer .

To form a nebula, gravity pulls matter together or causes collapse.

How do emission and reflection nebulae differ?(1 point) Responses interactions with light interactions with light the presence of young stars the presence of young stars hard line edges hard line edges contain remnants of stars

Emission and reflection nebulae differ in their interactions with light. Emission nebulae produce their own light through excited gas molecules, while reflection nebulae reflect light from nearby stars.

Which of these characteristics of a star make it most likely to become a black hole? Select the two correct answers.(1 point) Responses It has an abundant supply of hydrogen. It has an abundant supply of hydrogen. Its mass is equal to that of the sun. Its mass is equal to that of the sun. It is dying. It is dying. Its mass is greater than 20 times the mass of the sun.

The two correct answers are:

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

Which description best summarizes the steps that take place during black hole formation, in the correct order?(1 point) Responses A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses. A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses. Supernova triggers fusion reactions; massive star implodes due to extreme radiation; volume and mass of star increase rapidly. Supernova triggers fusion reactions; massive star implodes due to extreme radiation; volume and mass of star increase rapidly. A small star gains mass through fusion reactions; core of star collapses; increased radiation triggers a supernova. A small star gains mass through fusion reactions; core of star collapses; increased radiation triggers a supernova. Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects of gravity.

The correct description in the correct order is:

- A massive star depletes its nuclear fuel
- Gravity overpowers the star
- Supernova occurs
- Core of star collapses

Where could scientists look to observe a black hole?(1 point) Responses the solar system asteroid belt the solar system asteroid belt the center of the Milky Way the center of the Milky Way the edge of the solar system the edge of the solar system the center of the sun

Scientists could look to observe a black hole at the center of the Milky Way.

Which statement best describes the galaxies closest to the Milky Way?(1 point) Responses These galaxies consist of mostly old stars. These galaxies consist of mostly old stars. These galaxies are all identified as spiral. These galaxies are all identified as spiral. These galaxies are independent of and unaffected by the Milky Way's gravitational pull. These galaxies are independent of and unaffected by the Milky Way's gravitational pull. These galaxies include irregular, spiral, and elliptical types.

The statement that best describes the galaxies closest to the Milky Way is: These galaxies include irregular, spiral, and elliptical types.

Astronomers think that most galaxies are centered by a   Select Answer , which exerts   Select Answer that binds the galaxy together.

Astronomers think that most galaxies are centered by a supermassive black hole, which exerts gravitational force that binds the galaxy together.

What is the main challenge astronomers face when trying to directly detect black holes?(1 point) Responses Black holes are too small. Black holes are too small. Black holes are empty. Black holes are empty. Black holes trap all light. Black holes trap all light. Black holes are too black.

The main challenge astronomers face when trying to directly detect black holes is that black holes trap all light.