Approximately How Often Does a Spectacularly Active, Visible Comet Appear

question 13

Multiple Choice

Approximately how often does a spectacularly active, visible comet appear in Earth's sky?

• A) once a year
• B) once every 5 years
• C) once every 10 years
• D) once every 50 years
• E) once every 1,000 years

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Definitions:

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