Which description best summarizes the steps that take place during black hole formation, in the correct order?(1 point)
Responses
Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects of gravity.
Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects of gravity.
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.
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.
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.
Astronomers think that most galaxies are centered by a supermassive black hole, which exerts gravitational force that binds the galaxy together.
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.
These galaxies include irregular, spiral, and elliptical types.
Where could scientists look to observe a black hole?(1 point)
Responses
the center of the sun
the center of the sun
the solar system asteroid belt
the solar system asteroid belt
the edge of the solar system
the edge of the solar system
the center of the Milky Way
the center of the Milky Way
Scientists could look to observe a black hole at the center of the Milky Way.
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.
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.
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 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.
How do emission and reflection nebulae differ?(1 point)
Responses
the presence of young stars
the presence of young stars
contain remnants of stars
contain remnants of stars
hard line edges
hard line edges
interactions with light