Algol, Beta Persei, is a bright multiple star located in Perseus. It is the second brightest star in the constellation, after Mirfak, Alpha Persei. The star is also known as Gorgona, Gorgonea Prima, Demon Star and El Ghoul. It lies at an approximate distance of 90 light years from Earth and has an apparent magnitude that varies between 2.12 and 3.4.
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Alpha Centauri is the nearest star system to the Sun, located at a distance of only 4.37 light years or 1.34 parsecs from Earth. It is the brightest star in Centaurus constellation and the third brightest star in sky.
The Southern Cross is one of the best known asterisms in the night sky, and the most familiar star pattern in the southern hemisphere. The asterism is one of the easiest to identify in the sky and it has significance in a number of cultures in the southern latitudes.
Composed of five stars forming the shape of a cross, it is the most distinctive feature of the constellation Crux, the smallest constellation in the sky. The Southern Cross is notable for containing two bright stars, Acrux and Gacrux, which point the way to the Southern Celestial Pole.
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