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physical object > natural object > celestial body > radio source > Sagittarius A

Sagittarius A comparison table

Subject	has definition	has diameter	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 A	The very center of the Milky Way, Sagittarius A* is a strong source of radio waves and probably a massive black hole.	12 pc		radio source

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