According to ancient myths, the constellation Orion represents a great hunter, and Canis Major and Canis Minor were his hunting dogs. Orion is visible in the night sky all over the world. The three stars in a row between Rigel and Betelgeuse are Orion's belt. If you look closely at Betelgeuse, you will see that it has a distinct orange color. Rigel, by contrast, is blue.
Stars have different colors due to different temperatures.
A metal rod heated in a fire first begins to glow red, then orange, yellow, and finally white as it continues to heat up. Orange stars, like Betelgeuse, come next, followed by yellow stars, like our own sun, white stars, and blue-white stars. Blue stars, such as Rigel, are among the hottest stars in the sky. Hanging from the belt are three stars that form Orion's sword. If you look at the second star in the sword through binoculars, or a telescope, you will see that this object is not a star at all, but a glowing cloud of gas called a nebula.