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- Interstellar medium - The interstellar medium (or ISM) is the name astronomers give to the gas and dust that pervade interstellar space. While the interstellar medium refers to the matter that exists between the stars within a galaxy, the energy, in the form of electromagnetic radiation, that occupies the same volume is called ...
- Timeline of knowledge about the interstellar and intergalactic medium - Timeline of the interstellar medium and intergalactic medium
- Interstellar cloud - Interstellar cloud is the generic name given to an accumulation of gas, plasma and dust in our and other galaxies. Put differently, an interstellar cloud is a denser-than-average region of the interstellar medium.
- Interstellar reddening - In astronomy, interstellar reddening is a phenomenon associated with interstellar extinction where the spectrum of electromagnetic radiation from a radiation source changes characteristics from that which was emitted. Reddening occurs due to the light scattering off dust and other matter in the interstellar medium, not to be confused with redshifts which are proportional frequency shifts of spectra ...
- Diffuse interstellar band - Diffuse interstellar bands (DIBs) are absorption features seen in the spectra of astronomical objects in our galaxy. They are caused by the absorption of light by the interstellar medium.