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