Here are the correct answers for each question:
Question 1: How are nebulae and stars related? Select the three correct answers.
- Nebulae form from stars
- Stars form from nebulae
- Stars explode to form nebulae
Question 2: What causes a supernova?
- force of gravity (Specifically, the gravitational collapse of a massive star's core causes a supernova explosion.)
Question 3: What does it mean to characterize a nebula as diffuse?
- Its edges do not have clear boundaries.
Question 4: How can a planetary nebula be identified? Select the two correct answers.
- central star remnant
- spherical shape
Let me know if you need any further clarification or assistance!