Question

what is the difference between ursa major and ursa minor

Answer 1

Stars are spheres of plasma that is held by its own gravity and emit light due to nuclear fusion.
Constellations are arbitrary chosen regions in the sky that group's stars and other celestial objects according to they visible locations. Currently international astronomy union divided celestial sphere in to 88 constellations. Constellations is useful for new objects naming (supernovas) and to easier locate objects in sky.

Answer 2

Ursa major is the third largest constellation and is also known as the great Bear , big dipper, or the plough . It is visible in the northern hemisphere world. The constellation consist of seven stars
Ursa Minor is also known as the little bear or little dipper . The end of the dipper handle is Polaris, commonly known as the pole star. It is not easy to spot this constellation since it is not so bright
OR IT CAN BE ANSWERED ~
Ursa majorUrsa major is the third largest constellation and is also known as the great Barth big dipper, or the plough . it is visible in the northern hemisphere almost throughout the year. it has mythological significance throughout the world. The constellation consists of seven stars.Middle star in the handle is called mizar. Ursa minor is also known as the little dipper. this constellation also consists of seven stars and the star at the dipper handle is polaris commonly known as pole star. 
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