ammonia

Ammonia (NH₃) is a compound with molecules each consisting of one nitrogen and three hydrogen atoms. It is a colorless gas, lighter than air and is a weak base. It is a common component of fertilizer. Earth produces ammonia organically, and it is also found in the solar system including on Pluto, the giant planets, and some moons. It has also been detected in interstellar space and in other galaxies. It can serve as the material for both artificial and natural (astrophysical) masers.