C3E1P3H4E1I1D2
15 points
CEPHEID is validvalid
a giant star [n CEPHEIDS]
a star of a type having regular cycles of brightness which can be used to deduce their distances [n -S]
a giant star [n CEPHEIDS]
a star of a type having regular cycles of brightness which can be used to deduce their distances [n -S]