Travel in usa for The brightness fades over the following ? months. Afterwards, the binary system is restored to its former state. On rare occasions, the brightness of a nova may be suficient to render it visible to the naked eye e.g., Nova Cygni , which attained to + magnitude, approximately the brightness of the North Star, Polaris. FIG How a nova occurs. Image credit NASA/CXC/M. Travel in usa 2016.