A star is a large, naturally occurring fusion reactor. Stars are classified by size, content, heat, and position within life cycle.
star
It can be classified early in its lifecycle and classified as a different type of star as it ages.
Our sun is a star,
Our sun is a star,
In different groups
Brittle star
It is not. The sun is classified as a yellow star.
In different groups
No. Star signs are part of astrology, which is classified as pseudoscience.
The sun.
No. The sun is a star, not a planet.
Stars are classified by the H-R scale. They are classified by their luminosity and their temperature. They can also be classified by stage; our sun is a main sequence star while the center of the milky way is a black hole(the corpse of a super massive star).