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When does a comet's bright tail appear?

a.
when it nears the moon

b.
when it nears another comet

c.
when it collides with a planet

d.
when it nears the sun

User Zambonee
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2 Answers

6 votes
D.When It Is Near The Sun

User Peterph
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3 votes
When it nears the sun, due to the power of solar wind
User Another Ordinary
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