When looking for molecular hydrogen, astronomers actually look for

Name: When looking for molecular hydrogen, astronomers actually look for
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Astronomers look for carbon monoxide (CO) when searching for molecular hydrogen because H2 does not emit radiation that can be easily detected under cold, interstellar conditions. CO, however, does emit detectable radiation and is often found in the same regions as molecular hydrogen, making it a useful tracer.

When Looking for Molecular Hydrogen, Astronomers Actually Look for