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physical object > natural object > celestial body > radio source > Sagittarius B2 |
Sagittarius B2 comparison table |
Subject | has definition | has distance | is a kind of | is an instance of |
---|---|---|---|---|
radio source | A source of extraterrestrial radio radiation. The strongest known is Cassiopeia A, followed by Cyg A and the Crab Nebula (Tau A) (the capital letters following the name of a constellation refer to the radio sources of the constellation, A being the strongest source). Radio sources are divided into two main categories: Class I, those associated with our Galaxy (which is a weak radio source), and Class II, extragalactic sources. Most radio sources are galaxies, supernova remnants, or H II regions. | celestial body | ||
Sagittarius B2 | A massive (3 × 106 Msun), dense (up to 108 particles per cm3) H II region and molecular cloud complex - the richest molecular source in the Galaxy. It is in the galactic plane, near the galactic center. | 10 kpc distant | radio source |
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