The most common molecule in a molecular cloud is:

Name: The most common molecule in a molecular cloud is:
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Molecular hydrogen (H₂) is the most common molecule in a molecular cloud. This is because molecular clouds are composed of cold, dense gas and dust, and H₂ is the most abundant gas in the universe. However, it is difficult to observe directly, so astronomers often use tracers like carbon monoxide (CO) and ammonia (NH₃) to map the distribution of H₂ in these clouds.

The Most Common Molecule in a Molecular Cloud Is