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.
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.
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
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
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