A general term for material, usually gas and dust, surrounding a star. After a star’s birth, the surrounding cloud absorbs the visible light, re-emitting it as infrared radiation. Most young stars go through a violent phase, ejecting material at speeds of hundreds of kilometres per second. When this ejected material collides with the surrounding gas, bipolar molecular outflows (...
Reference Entry. 153 words.
Subjects: Astronomy and Astrophysics ; Astronomical Instrumentation, Methods, and Techniques ; Galaxies
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