How many stars does Orion have?

Orion can be regarded as the most magnificent constellation in the whole day. Winter sky, it hangs high in the sky, very easy to identify. Orion, located at the equator of the celestial sphere, consists of four bright stars in a big quadrangle. At the center of the quadrangle, the three stars hang obliquely in a straight line. People regard the quadrangle as the hunter's body with his head held high, and the three stars are the hunter's belt. These seven stars are the brightest seven stars in Orion. Some observable items: Alpha Star: Betelgeuse, a red giant, emits red light. Can be observed with the naked eye. Beta Star: Betelgeuse is a blue-and-white giant with a light blue light. Its color is in sharp contrast with Betelgeuse. This is the seventh bright star in the whole day. Can be observed with the naked eye. Sigma Star: Mintaka (three nights and three nights), a multi-star, located below the leftmost star of the belt Samsung. The brightness of the main star is 3.8, and there are two 7-magnitude stars and two 9-magnitude stars on both sides. Need a telescope to observe. M42 (Orion Nebula): An emission nebula, visible to the naked eye, about 1 square, with a fuzzy spot shape. It is best to observe with a telescope that a small nebula M43 extends from its north. Horsehead nebula: a dark nebula near zeta star. Named after the shape of a horse's head, you need a big telescope.