1. You never say the words “Aurora Borealis.”
But you do mention the Northern Lights in two specific situations:
First, in response to the scientifically accurate yet orally laborious “Aurora Borealis” by retorting, “Oh, you mean the Northern Lights?” (Alaskan for, “Ain’t from here, are ya?”)
And second, when saying “I was out on Northern Lights,” which indicates that you visited (or drove by) the store that makes every outdoorsy, granola, sock-clad, Birkenstock-wearing Alaskan heart swoon: REI.