People take photos of the Northern Lights, or Aurora Borealis, as they glow over Lake Washington in Renton, Washington. (AP Photo/Lindsey Wasson)
The Northern Lights flare in the sky over a farmhouse in Brunswick, Maine. (AP Photo/Robert F. Bukaty)
The Northern Lights glow in the sky near Kroschel, Minnesota. (Owen Caputo Sullivan via AP)
The Northern Lights are seen in the sky in Estacada, Oregon. (AP Photo/Jenny Kane)
The Aurora Borealis, also known as the Northern Lights, is visible over Ann Arbor, Michigan. (AP Photo/Dee-Ann Durbin)
The Northern Lights fill the sky at the Bogus Basin ski resort in Boise, Idaho. (AP Photo/Kyle Green)