How do emission and reflection nebulae differ?(1 point)

Question

Responses

the presence of young stars
the presence of young stars

hard line edges
hard line edges

contain remnants of stars
contain remnants of stars

interactions with light

Answer 1

The primary difference between emission and reflection nebulae lies in their interactions with light.

• Emission nebulae are regions that emit their own light because they are ionized by nearby young, hot stars. The gas in these nebulae absorbs energy from the stars and then re-emits it in the form of light, often making them appear brightly colored.

• Reflection nebulae, on the other hand, do not emit their own light but rather reflect the light of nearby stars. They tend to appear bluish, as blue light is scattered more effectively than other colors.

So, the correct answer from your options would be interactions with light.

Answer 2

Select the correct answer from the list.(1 point)
Astronomers think that most galaxies are centered by a
Select Answer
, which exerts
Select Answer
that binds the galaxy together.

Answer 3

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

Answer 4

Which statement best describes the galaxies closest to the Milky Way?(1 point)
Responses

These galaxies are all identified as spiral.
These galaxies are all identified as spiral.

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

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 consist of mostly old stars.

Answer 5

The statement that best describes the galaxies closest to the Milky Way is:

These galaxies include irregular, spiral, and elliptical types.

The Milky Way has several neighboring galaxies, including the Andromeda Galaxy (spiral), the Large and Small Magellanic Clouds (irregular), and several others that can be classified as elliptical or other types.

Answer 6

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.

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 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.

Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects of gravity.

Answer 7

The description that best summarizes the steps that take place during black hole formation, in the correct order, is:

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

This sequence outlines the process correctly: a massive star runs out of nuclear fuel, leading to gravitational collapse, which results in a supernova explosion, and finally, the core collapses, potentially forming a black hole if the core's mass is sufficient.

Answer 8

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

Answer 9

Scientists could look to observe a black hole at the center of the Milky Way. The Milky Way's center is known to harbor a supermassive black hole called Sagittarius A*. This black hole can be studied through the motion of nearby stars and the emission of X-rays from the surrounding accretion disk.

Answer 10

What is the main challenge astronomers face when trying to directly detect black holes?(1 point)
Responses

Black holes are too black.
Black holes are too black.

Black holes trap all light.
Black holes trap all light.

Black holes are too small.
Black holes are too small.

Black holes are empty.

Answer 11

The main challenge astronomers face when trying to directly detect black holes is that black holes trap all light. Because black holes have such strong gravitational fields, not even light can escape once it crosses the event horizon, making them invisible and difficult to detect directly. Instead, astronomers often infer their presence through the effects they have on nearby matter or by observing emissions from the accretion disk around them.