It is a descriptive adjective. Such as in this sentence: That star is the brightest star I have ever seen.
It is a descriptive adjective. For example: That woman has the brightest teeth. They nearly blind me.
photosphere
Most of the times, the brightest part of the galaxy is at the ceentre due the higher density of stars .Also if the galaxy is a spiral then the brightest part of the galaxy are the spiral arms because they are the star formation areas in the galaxy
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
After the Sun, the brightest star is Sirius, in the constellation Canis Major. However, while Sirius is the brightest star visible from the Northern Hemisphere, it is part of a southern hemisphere constellation. Therefore, Arcturus, in Bootes, would be the brightest Northern Hemisphere star.
Canis Major contains the brightest star, Alpha Canis Majoris, or Sirius A.
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.