From the August 2008 issue

In Chicago, shortly before World War II began, I saw the evening sky turn blood red. What caused this?

Katherine Krupp, Mesa, Arizona
By | Published: August 25, 2008 | Last updated on May 18, 2023
The crimson glow you saw occurred September 18, 1941. It was the opening act of one of the greatest auroral displays recorded in the central United States.