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doit_the_clown doit_the_clown
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7 years ago
A planetary nebula is
A)   a shell of ejected gases.
B)   the formation stages of planets around stars.
C)   a gas cloud surrounding a planet after its formation.
D)   the spherical cloud of gas produced by a supernova explosion.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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doit_the_clown Author
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7 years ago
Thank you, thank you, thank you!
foxrcng11
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Yesterday
Good timing, thanks!
MLynneMcMillan
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2 hours ago
You make an excellent tutor!
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