Lopez-Sanchez said it is well-documented that Betelgeuse is a variable star, meaning it changes brightness periodically.

Beta Persei is another well-known variable star.

Kung may be a variable star.

The variable star in Ophiuchus has an analogous system, and observation has already revealed a great number of others.

The period over which a variable star's brightness changes is unique for each star, making them interesting targets as landmarks.

It is unlikely, though, that the Colonials have a comprehensive database of every red supergiant or variable star in the Galaxy.

Some were quick to point out that Betelgeuse is classed as a semi-regular variable star, meaning its brightness is prone to change.

A variable star is one which brightens over a period of time, eventually becoming visible to the naked eye, before dimming again.

Today is the 400th anniversary of the discovery of the first variable star, named Mira after the Latin word for "wonderful".

That is, however, not the received opinion about variable stars.

But these variable stars are still obscure, and we do not need their aid.

Hubble not only found a number of stars in Andromeda, he found Cepheid variable stars.

There are several others of the same type: these are not, properly speaking, variable stars.

It is overblown and soulless -a tin-canfinal part in Disney's variable Star Wars trilogy.

Hubble observed that certain regular variable stars in our Galaxy could also be seen in other galaxies.

I have also taken up the observation of variable stars in a limited portion of the heavens.