Q. The ring nebula is an example of a planetary nebula. It is

A
a ring of planets circling a Star.
B
an expanding ring of gas released from dying star
C
a contracting ring of gas and dust falling circling into a massive object.
D
a ring of Stars in a circular orbit
Solution:

A planetary nebula is a shell of material ejected from a dying star. Located about 2,000 light years from Earth in the constellation Lyra, the Ring Nebula is also known as Messier Object 57 and NGC 6720. It is one of the best examples of a planetary nebula and a favorite target of amateur astronomers

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