How can a planetary nebula be identified? Select the two correct answers.(1 point)
Responses
central star remnant
central star remnant
dark area
dark area
diffuse edges
diffuse edges
spherical shape
central star remnant and spherical shape
How are nebulae and stars related? Select the three correct answers.(2 points)
Responses
Stars form from nebulae.
Stars form from nebulae.
Nebulae explode to form stars.
Nebulae explode to form stars.
Stars explode to form nebulae.
Stars explode to form nebulae.
Nebulae are found inside stars.
Nebulae are found inside stars.
Stars are pulled toward nebulae.
Stars are pulled toward nebulae.
Nebulae form from stars.
Stars form from nebulae.
Nebulae explode to form stars.
Nebulae form from stars.
What does it mean to characterize a nebula as diffuse?(1 point)
Responses
Its edges do not have clear boundaries.
Its edges do not have clear boundaries.
It reflects only visible radiation.
It reflects only visible radiation.
It reflects only non-visible radiation.
It reflects only non-visible radiation.
Its edges have clear boundaries.
Its edges do not have clear boundaries.
What causes a supernova?(1 point)
Responses
energy of heat
energy of heat
energy of a nebula
energy of a nebula
force of a nebula
force of a nebula
force of gravity