Albireo AB

Environmental & Science Education, STEM, Earth & Space Sciences, Cosmology, Astrophysics, History of Science, Nature of Science

Ed Hessler 

Astronomy Picture of the Day (APOD) has an image of a star which turns out to be a double star, seen only with telescopic aid.  It includes the visible spectrum of both stars which shows how different the two stars are.

The image is lovely and the explanation adds to the pleasure of seeing it as well as in not misunderstanding what you are seeing.

For stargazers, planet watchers, the constellation savvy, the scientific term "asterism" is well known. I'd never heard of it --not included in the explanation which gave me an idea of what a common term it is --  and Wiki explains the term.  The explanation also includes a comment on how astronomers/astrophysicists reason.