Even though they account for only about 1% of the mass of a typical interstellar cloud, interstellar dust grains play a crucial role in the creation of this rich variety of molecules and in the process of star formation.

BBC: University of Nottingham

He notes that should produce radiation capable of ionizing the helium contained in the interstellar medium.

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The "Halo" series chronicles an interstellar war between humans and aliens known as the Covenant.

CNN: Web series builds anticipation for 'Halo 4'