Named after the hunter son of Greek God Poseidon, Orion is one of the most identifiable constellations in the night sky.
Most of the constellation’s 20+ stars are blue giants, the brightest being Rigel. Rigel is around 800 light years from Earth and is around 75 times larger in diameter than the sun, and around 40,000 times brighter.
Largest is the red giant Betelgeuse. Around 640 light years from Earth, Betelgeuse, has a radius 1,000 times larger than the sun. If placed in our solar system, its radius would extend to beyond the asteroid belt. Approaching the end of its life, it’s expected to explode as a supernova in the next million years.
There’s also binary star system Meissa, and the triple star system Alnitak.
Orion also contains nebula like Trapezium and the Horsehead Nebula.
Trapezium, at an approximate distance of 1,500 light-years, is a star-forming region, whose members are only a few hundred thousand years old.
The Horsehead Nebula, also approximately 1500 light-years from earth, is a star-forming region comprised of clouds of dark dust and gases.