Assertion: nebula's star | /r/CapableOf | show variation
Facets:
value: in brightness
type: OTHER
Source sentences:
text: It is classified as a BY Draconis type variable, a star showing variations in brightness as a result of rotation coupled with star spots and other chromospheric activity.
text: The star is classified as a Beta Cephei variable, a star that exhibits variations in brightness as a result of pulsation of its surface.