This star is known to vary in brightness over a regular time interval. The cycle lasts exactly 2 days, 20 hours and 49 minutes. All the while, the star remains visible to the eye. Algol's brightness variations are not due to some special quality of a single star. In fact, this is a multiple star system, where one star regularly passes in front of another as seen from our earthly perspective.
Early stargazers had no way to know why Algol varied in brightness. But it's likely that they did notice this star's brightness change. Throughout parts of the ancient world, Algol was associated with demons or monsters. The Greeks and Romans identified the star with the Head of Medusa, a fearful monster with snakes in place of hair. The star has also been called The Ghoul Star.
Dog Star
Sirius also known as the dog star is the brightest star in the sky.
As we see it, it is the brightest star in the night sky.
Its called Sirius and also called Dog star.
brightest star:north star nickname:dog star
The three brightest stars in the sky are Sirius, Canopus, and Alpha Centauri. Sirius is also known as the "Dog Star" and is the brightest star in the night sky. Canopus is the second brightest star and Alpha Centauri is the third brightest star.
Sirius, also known as the "Dog Star," is the brightest star in Earth's night sky. It is roughly twice as bright as Canopus, the next brightest star.
The brightest star in the sky is called Sirius which is also called the Dog star.
Sirius is the brightest star and can be seen from the UK. Link: http://en.wikipedia.org/wiki/Sirius ----
Sirius is the brightest star in the sky. It is in the constellation of Canis Major, visible in the northern hemisphere during the winter months. Canis Major is also known as the Big Dog, earning the star its nickname -- "the Dog Star."
== == Sirius is the Dog Star, the brightest star (after the sun) in the sky.
The star Sirius is the brightest star visible from the earth. Sirius is in the Canis Major constelation, and is therefore often refered to as "the Dog Star"