NaCl is not a common molecule found in interstellar space because it is too easily dissociated by the high-energy radiation present in space.

H2 is the most abundant molecule in the universe, accounting for about 75% of all matter.

Ion-molecule reactions are the primary mechanism for the formation of molecules in space.

Radio astronomy is the most common method used to detect molecules in space because it allows astronomers to study the rotational and vibrational transitions of molecules.

HII regions are ionized hydrogen regions that emit a characteristic red color due to the recombination of electrons with protons.

Molecules play a crucial role in the formation of stars and planets by providing the raw material, cooling the gas and dust, and transporting angular momentum.

The origin of life on Earth is thought to have involved a combination of H2O, CO2, CH4, and NH3, which are known as the prebiotic molecules.

Cometochemistry is the study of the chemical composition of comets.

CH4 is responsible for the characteristic green color of many planetary atmospheres, such as Uranus and Neptune.

Interstellar chemistry is the study of the chemical composition of interstellar clouds.

Dust particles scatter blue light more efficiently than other colors, giving reflection nebulae their characteristic blue color.

Stellar chemistry is the study of the chemical composition of stars.

Sodium is responsible for the characteristic yellow-orange color of many stars, including our Sun.

Galactic chemistry is the study of the chemical composition of galaxies.

HII regions are ionized hydrogen regions that emit a characteristic red color due to the recombination of electrons with protons.