Which of the following statements about planetary nebulas is correct?
A) They are shells of glowing gas and dust ejected by dying Sun-like stars.
B) They contain flakes of carbon and silicon material.
C) They expand at a typical rate of 20 kilometers per second.
D) Their shape can be very irregular.
E) All of these choices are correct.

Question

Quizplus · Accepted Answer

Planetary nebulas are indeed shells of gas and dust ejected by dying stars, they can contain carbon and silicon material, they typically expand at around 20 km/s, and their shapes can be irregular.

Which of the Following Statements About Planetary Nebulas Is Correct