How can a planetary nebula be identified? Select the two correct answers.(1 point)

spherical shape and central star remnant

How are nebulae and stars related? Select the three correct answers.(2 points)

Responses

Nebulae explode to form stars.

Nebulae form from stars.

Stars explode to form nebulae.

Nebulae are found inside stars.

Stars are pulled toward nebulae.

Stars form from nebulae.

Nebulae form from stars.

Stars form from nebulae.
Stars explode to form nebulae.

What causes a supernova?(1 point)

Responses

force of a nebula

energy of a nebula

energy of heat

force of gravity

force of gravity

What does it mean to characterize a nebula as diffuse?(1 point)

Responses

Its edges do not have clear boundaries.

Its edges have clear boundaries.

It reflects only visible radiation.

It reflects only non-visible radiation.

Its edges do not have clear boundaries.