The different manifestations of the basic observation:
The existence of luminescent ionized hydrogen nebulae surrounding hot stars, and reflective of gas-dust nebulae in the vicinity of the cooler stars.
The weakening of light stars (interstellar absorption) due to dust, part of the interstellar medium. As well as the red light, the presence of opaque nebulae.
Polarization of light in the dust, oriented along the magnetic field of the Galaxy.
Infrared radiation of interstellar dust
Radio neutral hydrogen in radio at a wavelength of 21 cm
Soft X-ray emission of hot rarefied gas.
Synchrotron radiation of relativistic electrons in interstellar magnetic fields.
Cosmological maser amplifier.
The structure of MFA is not trivial and non-uniform: the giant molecular clouds, the reflective nebula, protoplanetnaya Nebula, planetary nebula, globule, etc. This leads to a wide range of expression and observation of processes occurring in the environment. Next, the table lists the properties of the main components of the environment.