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