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| physical object > natural object > celestial body > X-ray source > transient X-ray source | 
| transient X-ray source | ||||
| subject | fact | |||
| transient X-ray source | has definition As of early 1974, four had been detected: Cen X-2, Cen X-1, 2U 1543-47, and Cep X-4. They resemble slow novae. | ![]()  | 
| is a kind of X-ray source | ![]()  | |
| 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 | ![]()  | 
Kinds of transient X-ray source :