The number of comets that have thus far been observed is about
A) 40
B) 4 thousands
C) 4 million
D) 4 billion

Name: The number of comets that have thus far been observed is about A) 40 B) 4 thousands C) 4 million D) 4 billion
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As of my last update, approximately 4,000 comets have been observed and cataloged by astronomers. This number includes both long-period and short-period comets that have been identified through various means, including telescopic observations and space missions.

The Number of Comets That Have Thus Far Been Observed