cepheid variables
The Cepheus Constellation
Located in the northern hemisphere is Cepheus, one of the 48 constellations included by Ptolemy in his classic work, The…
What are Cepheid Variables?
Discovered in the late 18th century, Cepheid Variable stars have become an important tool for measuring the size of the…
How Do We Measure Distance in the Universe?
This star is X light-years away, that galaxy is X million light-years away. That beginning the Universe is X billion…
What’s Going On Inside This New Kind of Variable Star?
A new kind of variable star -- 36 of that type, in fact -- has been found in a single…
Another Ceasing Cepheid
[/caption] Earlier this year, I wrote an article about a Cepheid variable star named V19 in M31. This Cepheid was…
The Little Cepheid that Stopped
[/caption] When Hubble first discovered a Cepheid variable in the galaxy M31, the universe grew. Previously, many astronomers had held…
Longstanding Cepheid Mass Mystery Finally Solved
[/caption] Cepheid variable stars - a class of stars that vary in brightness over time - have long been used…