A variable star is, quite simply ... variables that expand and shrink dramatically within a short period of time, following a specific pattern. Astronomers can make distance measurements to ...

the luminous blue variable (LBV) is a relatively rare and still somewhat mysterious type of star. Its appearance tends to fluctuate radically over time, and that has piqued the curiosity of ...

A Cepheid Variable fluctuates every one to 50 days; from minimum light a Cepheid will double in brightness to maximum light. Astronomers found a relation between the time period and the star’s ...

Astronomers using the Swiss 1.2-metre Euler telescope at ESO’s La Silla Observatory in Chile have found a new type of variable star ... variations for the first time. “We have reached this ...

The brightest star ... time from the same location. For a look ahead at more upcoming sky events, check out our full Sky This Week column. The post The Sky Today on Monday, May 19: The variable ...