Editing Light pollution (section)

=== Bortle scale ===
The [[Bortle scale]] is a nine-level measuring system used to track how much light pollution there is in the sky. A Bortle scale of four or less is required to see the [[Milky Way]] whilst one is "pristine", the darkest possible.<ref>{{Cite web|url=https://www.forbes.com/sites/startswithabang/2016/06/14/the-milky-way-invisible-to-most-of-us-but-accessible-to-all/|title=The Milky Way: Invisible To Most Of Us, But Accessible To All|last=Siegel|first=Ethan|date=June 14, 2016|website=[[Forbes]]|access-date=November 16, 2019|archive-date=March 11, 2021|archive-url=https://web.archive.org/web/20210311005605/https://www.forbes.com/sites/startswithabang/2016/06/14/the-milky-way-invisible-to-most-of-us-but-accessible-to-all/|url-status=live}}</ref>