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

Cassiopeia A (3C 461, 3U 2321+58)
subject			fact

Cassiopeia A	is a part of Cassiopeia
	has expansion velocity 800 km s-1
	has distance 3 kpc
	has synonym 3C 461
	has synonym 3U 2321+58
	has definition A radio source in Cassiopeia, the strongest extrasolar source in the sky, believed to be the remnant of a Type II supernova whose light reached Earth about 1667. Optically it is a faint nebula. It has a mass of a few solar masses. It is also an extended source of soft X-rays.
	is an instance of radio source
	is an instance of X-ray source
radio source	has wavelength radio
	is a part of celestial sphere
	has catalog radio source catalog
X-ray source	has wavelength X-ray
	is a part of celestial sphere
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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