Big Lake, Alaska
iWitness Contributor Gerard Billinger says his daughter Jennifer Shriner Billinger took this photo of the Northern Lights from Big Lake, Alaska.
You're running out of time to see the Northern Lights during their latest peak.
The Northern Lights, also known as the aurora borealis, take the shape of smoking skies, pinwheels or curtains. They're seen most often near the poles, with prime viewing in late fall, winter, and very early spring.
(MORE: NASA Makes New Discovery)
The aurora is caused by solar particles moving in Earth's magnetosphere. NASA explains "when the magnetic fields lines reconnect in an area known as the magnetotail, energy is released and it sends the particles down onto Earth's poles." At one point the atoms give off a photon of light, which result in the spectacular colors in the sky.
The Northern Lights have been quite impressive since 2011. iWitness contributors have captured dozens of photos that capture the majesty and wonder of the aurora. Check out some of our favorite taken in North America in the slideshow above.
(PHOTOS: Incredible Comets)
As the spring equinox approaches on March 21, prime viewing for this winter will come to an end. You can check the University of Alaska's Aurora Forecast, provided by the Geophysical Institute, if you're curious about best viewing days in the near future.