The below is an image captured through a telescope. At times though comets are visible to the naked eye. When I was in college, the Comet Hale-Bopp was visible and bright in the sky. It stuck around for a while. So long that we got accustomed to seeing it every night.

Source: NASA’s Astronomy picture of the Day, August 6, 2011
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Challenge
What is the most famous comet visible periodically in North America and when will if be visible again?
-Mike
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