Notice the two somewhat distinctive hues from the stars which make up Albireo, the double star in the nose of Cygnus the Swan. They can be very easily witnessed as a result of binoculars or a small telescope. The metallicity of a star measures the amount of "metals" it's — https://emilianoc5lkj.articlesblogger.com/60080796/the-5-second-trick-for-hoteljob