The aurora borealis, or northern lights, fill the sky above the Takotna, Alaska checkpoint during the Iditarod Trail Sled Dog Race on Wednesday, March 9, 2011. (AP Photo/The Anchorage Daily News, Bob Hallinen, File) ( Iditarod-Photo Gallery )
The aurora borealis lights up the sky with color, Thursday, Dec. 14, 2006 as seen from Lattnerville, Iowa. (AP Photo/Telegraph Herald, Dave Kettering) ( Aurora Borealis )
The northern lights, Aurora Borealis, dance over West Grand Traverse Bay, north of Traverse City, Mich., Sunday, Oct. 21, 2001. Caused by solar storms, the dancing lights lit up the northeast section of the sky all night, flashing colors as high as the zenith point, directly overhead. This is a 20-second exposure on 400 ASA film. (AP Photo/Traverse City Record-Eagle, John L. Russell) ( DANCING SKY )
Aurora borealis lights up the sky northwest of Lawrence, Kan., early Monday Nov. 8, 2004. The borealis were easily seen with clear skies and a late rising crescent moon, making for optimum conditions early Monday. (AP Photo/Lawrence Journal-World, Scott McClurg) ( TOPIX NORTHERN LIGHTS )
The northern lights or aurora borealis fill the western sky Friday, March 9, 2012, above the Russian Orthodox Saint Nicholas Memorial Chapel in Kenai, Alaska. The display of lights came in the aftermath of a solar storm that struck Earth on Thursday. (AP Photo/Peninsula Clarion, M. Scott Moon) ( APTOPIX Northern Lights )
Aurora Borealis, also known as the Northern Lights, illuminate the sky above the Cripple Creek area southwest of Fairbanks, Alaska shortly before midnight Tuesday night, Feb. 5, 2002. (AP Photo/Fairbanks Daily News-Miner, Eric Engman) ( NORTHERN LIGHTS )
The Aurora Borealis glows in the sky, September 03, 2007, in the Greenland town of Kangerlussuaq. The Northern Lights most often occurs from September to October and from March to April and are a popular tourist attraction. (Photo by Uriel Sinai/Getty Images) ( 76628912US0055_TOURISTS )
The aurora borealis illuminates the night sky Monday, Nov. 5, 2001, near Ellis, Kan., during a spectacular show not commonly seen in Kansas. The displays are associated with an interaction between the solar wind, a continuous flow of electrically charged particles from the sun, and the earth's magnetic field. (AP Photo/Hays Daily News, Steven Hausler) ( MEMBER SHOWCASE )
In this Feb. 29, 2008 file photo, an Aurora Borealis spins above the Talkeetna Range and a hay field on Farm Loop Road near Palmer, Alaska. (AP Photo/Bob Martinson/FILE) ( YE Northen Lights Aurora Borealis )
The aurora borealis, or northern lights, fill the sky early Sunday, March 17, 2013, above the Holy Assumption of the Virgin Mary Russian Orthodox church in Kenai, Alaska. The bright display at times filled the sky. (AP Photo/M. Scott Moon) ( APTOPIX Northern Lights )
The Aurora Borealis glows over a direction sign naming famous capital cities of the world in the Kangerlussuaq Airport September 3, 2007, near the Greenland town of Kangerlussuaq. Greenlanders voted on November 25, 2008 on its relationship to Denmark with 76 percent of voters favoring looser political ties. The Northern Lights most often occurs from September to October and from March to April and are a popular tourist attraction. (Photo by Uriel Sinai/Getty Images) ( GYI0000710200.JPG )
The northern lights dance and swirl over the Chuguch Mountains near Anchorage, Alaska, in this undated file photo. Astronomy buffs and scientists are using satellite data via the Internet to get a good look at the northern lights. (AP Photo/Evan Steinhauser Photography, File) ( EXP AURORA WATCHERS )
This picture taken overnight on March 17, 2013 shows the Aurora borealis, or northern lights, seen in Tallinn. RAIGO PAJULA/AFP/Getty Images ( 518271534 )
The Aurora Borealis glows over a lake September 02, 2007, near the Greenland town of Kangerlussuaq. The Northern Lights most often occurs from September to October and from March to April and are a popular tourist attraction. (Photo by Uriel Sinai/Getty Images) ( 76628912US0042_TOURISTS )
The Aurora Borealis glows over a hut near the town of Kangerlussuaq September 02, 2007, in the Greenland town of Kangerlussuaq. The Northern Lights most often occurs from September to October and from March to April and are a popular tourist attraction. (Photo by Uriel Sinai/Getty Images) ( 76628912US0040_TOURISTS )
This Jan. 23, 2012 file photo shows the aurora borealis, or Northern Lights, near the city of Talkeetna, Alaska. This year and next year are expected to offer prime viewing for the northern lights due to a peak in the cycle of solar activity that causes the lights. The Fairbanks region of Alaska is gearing up for increased tourism as visitors flock to see the colorful but elusive phenomenon. (AP Photo/Michael Dinneen, file) ( Travel-Alaska-Northern Lights )
The largest solar storm in five years sent a huge wave of radiation into earth's atmosphere creating a brilliant show of the aurora borealis near Yellowknife, North West Territories on Thursday March 8, 2012. Yellowknife, which is situated directly under the auroral "oval", has some of the best northern lights viewing in the world. Truckers returning from the diamond mines 330 kilometers northeast enjoy the nighttime spectacle as they cruised down the ice road on Prosperous Lake. (AP Photo/The Canadian Press, Bill Braden) ( Aurora Borealis Solar Storm )
In this Feb. 14, 2012, file photo, the northern lights or aurora borealis shimmer in the sky above Kenai, Alaska, shortly before daybreak. This year and next year are expected to offer prime viewing for the northern lights due to a peak in the cycle of solar activity that causes the lights. The Fairbanks region of Alaska is gearing up for increased tourism as visitors flock to see the colorful but elusive phenomenon. (AP Photo/Peninsula Clarion, M. Scott Moon) ( Travel-Alaska-Northern Lights )
The Aurora Borealis bright up the sky at twilight on March 17, 2013 between the towns of Are and Ostersund, Sweden. JONATHAN NACKSTRAND/AFP/Getty Images ( 518251907 )
This picture taken overnight on March 17, 2013 shows the Aurora borealis, or northern lights, seen in Tallinn. TRAIGO PAJULA/AFP/Getty Images ( 518271527 )
The Aurora Borealis bright up the sky at twilight on March 17, 2013 between the towns of Are and Ostersund, Sweden. JONATHAN NACKSTRAND/AFP/Getty Images ( 518251932 )
The Aurora Borealis bright up the sky at twilight on March 17, 2013 between the towns of Are and Ostersund, Sweden. JONATHAN NACKSTRAND/AFP/Getty Images ( 518251950 )
TOPSHOTS
The Aurora Borealis bright up the sky at twilight on March 17, 2013 between the towns of Are and Ostersund, Sweden. JONATHAN NACKSTRAND/AFP/Getty Images ( 518262473 )
This picture taken overnight on March 17, 2013 shows the Aurora borealis, or northern lights, seen in Tallinn. RAIGO PAJULA/AFP/Getty Images ( 518282837 )
This astronaut photograph highlights the Chicago metropolitan area as the largest cluster of lights, next to the dark patch of Lake Michigan. The other largest metropolitan areas include St. Louis, Minneapolis–St. Paul, and the Omaha–Council Bluffs region on the Nebraska–Iowa border. The northeastern seaboard lies just beyond the Appalachian Mountains, a dark winding zone without major cities. The artificial light from human settlements appears with a characteristic yellow tinge. The green light of the aurora borealis also shines brightly in this view—even seeming to reflect off Earth’s surface in Canada. A small white patch of light is almost certainly lightning from a storm on the East coast (image top right). Part of the International Space Station (ISS) appears across the top of the image. (Photo by NASA) ( auroraNASA.jpg )
Aurora Borealis is seen over Boulder. Photo was taken in Coal Creek Canyon. The photo is looking over Boulder, Colorado NEE. Photo Spcl to the Denver Post - Paul Soderbloom ( borealis.JPG )
The aurora borealis, or northern lights, fill the sky early Sunday, March 17, 2013, above a motorist stopped in a roadside scenic pullout in Kenai, Alaska. The bright display at times filled the sky. (AP Photo/M. Scott Moon) ( Northern Lights )
The red glow of the aurora borealis covers the northeastern sky around 9:30 pm, EDT, Thursday, April 6,, 2000 in this fish-eye view taken 10 miles northeast of Fayetteville, N.C. Solar flares cause the aurora or 'northern lights.' A shed and windsock used by a local model aircraft flying club sits in the foreground. (AP Photo, The Fayetteville Observer, Johnny Horne) ( MEMBER SHOWCASE )
A band of Aurora Borealis, the Northern Lights, stretches over the Chugach Range near Palmer, Alaska in this February file photo. Scientists think they have discovered the energy source of the spectacular color displays seen in the northern lights. (AP Photo/Bob Martinson, FILE) ( Northern Lights )