ikenbot: The Current Types of Nebulae Originally, the word “nebula” referred to almost any extended astronomical object (other than planets and comets). The etymological root of “nebula” means “cloud”. As is usual in astronomy, the old terminology

ikenbot: The Current Types of Nebulae Originally, the word “nebula” referred to almost any extended astronomical object (other than planets and comets). The etymological root of “nebula” means “cloud”. As is usual in astronomy, the old terminology

tags: IL MIO LATO OSCURO...,

from: http://laharenthu.tumblr.com/post/49712214198