A planetary nebula is a type of emission nebula that forms when a low-mass star, such as the Sun, reaches the end of its life and expels its outer layers. The expelled gas is ionized by the central star's ultraviolet radiation, producing an emission spectrum.

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A Planetary Nebula

Question 27

Multiple Choice

A planetary nebula

A) produces an absorption spectrum.
B) produces an emission spectrum.
C) is contracting to form planets.
D) is contracting to form a star.
E) is the result of carbon detonation in a 1- A planetary nebula A) produces an absorption spectrum. B) produces an emission spectrum. C) is contracting to form planets. D) is contracting to form a star. E) is the result of carbon detonation in a 1- star. star.