Sentence:  Located 11,000 light-years away in the northern <WSD>constellation</WSD> Cassiopeia, Cas A is the remnant of a once massive star that died in a violent explosion 325 years ago. 
Meaning of the word marked with <WSD> tags:  Any of the 88 regions of the sky officially recognized by the IAU, including all stars and celestial bodies in the region. (1920s)