Interstellar molecules

Definition

Interstellar molecules are complex chemical compounds found in the space between stars, within interstellar gas and dust clouds. These molecules can range from simple diatomic species to more complex organic compounds.

5 Must Know Facts For Your Next Test

1. Interstellar molecules are primarily detected through their unique spectral lines in the radio and infrared regions.
2. Molecular clouds, which contain a high density of interstellar molecules, are often the birthplaces of new stars.
3. The most common interstellar molecule is molecular hydrogen (H2), but over 200 different molecules have been identified.
4. Interstellar molecules can form on the surfaces of dust grains or through gas-phase reactions in space.
5. The study of interstellar molecules helps astronomers understand the chemical processes and conditions prevalent in different regions of space.

Review Questions

• How are interstellar molecules typically detected?
• What role do molecular clouds play in star formation?
• What is the most common interstellar molecule?

Related terms

Molecular Cloud: A type of interstellar cloud that has a high enough density to allow for the formation of molecules, including H2.

Spectral Line: A specific wavelength or frequency at which atoms or molecules emit or absorb light, used to identify chemical compositions.

Dust Grain: Tiny solid particles found in space, around which some interstellar molecules can form through surface reactions.