The Sun, otherwise known as Sol. In at second, Sirius.
the blue giant is the brightest star
The brightest star as seen from Earth is the sun. The brightest star in the night sky is Sirius.
Sirius is the brightest star and can be seen from the UK. Link: http://en.wikipedia.org/wiki/Sirius ----
It is a descriptive adjective. Such as in this sentence: That star is the brightest star I have ever seen.
The least brightest star has not yet been seen and so not identified.
The south star
Arcturus is the brightest star that can be seen during the summer. Vega is also visible during the summer and would also be very bright, but not as bright as Arcturus.
The Rigel star is a star in the Orion constellation. Rigel is the brightest star in the Orion constellation, and it is the seventh brightest star seen in the night's sky.
the moon.
The sun is the brightest star as seen from Earth, but that is only because it is much closer to us than any other star.
Its possible to see Sirus. Its the brightest star you can in the Sky.
The brightest star would be the Sun. See related question.