Eta Orionis is a star system at a distance of 900 light years from Earth and part of the Orion Arm. Eta Orionis is part of the constellation of Orion and lies a little to the west of the Belt of Orion between Delta Orionis and Rigel, being closer to Delta Orionis than to Rigel. It is an eclipsing binary system consisting of two blue stars orbiting one another in a regular pattern. A star system or stellar system is a system comprised of a star or group of stars, with possibly planetary systems of smaller bodies (such as planets or asteroids), in close gravitational association. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Earth is the third planet from the Sun. ... Observed structure of the Milky Ways spiral arms The Orion Arm or Local Arm (labeled 0) is a minor, spiral arm of the Milky Way galaxy. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Orion, a constellation often referred to as The Hunter, is a prominent constellation, perhaps the best-known in the sky. ... Delta Orionis (δ Ori / δ Orionis) is one of the three stars of the belt of the Orion constellation. ... Rigel (pronounced ) (β Orionis) is the brightest star in the constellation Orion and the seventh brightest star in the sky, with visual magnitude 0. ... A binary system is an astronomy term referring to two objects in space, usually stars, which are so close that their gravitational forces attract one another into a mutual orbit. ... A Blue Star was placed in the window of families with children in the military in a war zone to encourage safe return. ...