The aurora borealis' brilliantly colorful display was caught on film last night as it appeared farther south than usual.
The Chicago Tribune reports that the the aurora borealis peaked between 8:30 and 9:15 p.m. The display marked Chicago's first significant aurora borealis appearance in seven years.
The aurora borealis is a natural lights display in the sky that typically occurs in high latitude Arctic and Antarctic regions. It is caused by the collision of charged energy particles with atoms in the high altitude atmosphere.
You can view photos of the aurora borealis here.