Ammonia tells the time in space.

Details Ammonia tells the time in space. Ammonia tells the time in space.

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990asnow...4...23m&link_type=abstract

Astronomy Now, Vol. 4, No. 10, p. 23 - 24

Astronomy and Astrophysics

Astronomy

Molecular Clouds: Ammonia, Molecular Clouds: Ages

Scientific paper

When ammonia molecules undergo a particular type of collision, they act
like microwave lasers (masers). By analysing this effect on two types of
hydrogen, the age of the molecular cloud could well be established.

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