Between the stars. / Among the stars.

(astronomy) the dimming of light from the stars due to absorption and scattering from dust in the interstellar medium

The space between the stars.

plural of interstellar space

(astronomy, planetology) A comet (or exocomet) located in interstellar space, and not gravitationally bound to a star.

plural of interstellar planet

plural of interstellar comet

(astronomy, planetology) a planetary-mass object which has either been ejected from its system or was never gravitationally bound to any star or other such object, and that therefore orbits the galaxy directly.

(astronomy) The matter that exists in the space between star systems in a galaxy, including gas, dust, and cosmic rays.

The polarization of the light received from distant stars as a result of interaction with dust particles