

Aurora Australis (curtain form) is seen from the Space Shuttle Endeavour, part of which can be seen in left foreground, in April 1994.
Aurora Borealis is seen near Fairbanks, Alaska in 2003. The light is caused by explosions on the surface of the Sun, which throw out electrically charged particles towards the Earth.
Aurora Borealis is viewed from space in this undated NASA photograph. When the solar wind carrying the sun's particles hits our atmosphere after its 3 million mile journey, it is swept towards the poles by our magnetic field where the particles react with ions in the atmosphere, causing Mother Nature's greatest light show
This photo taken on March 1, 2011 shows a spectacular of Aurora Borealis, or the northern lights, in Kiruna, Sweden.
Nothern Lights are seen in Teriberka Village near Shtocmann Oilfield, outside Murmansk Oblast, Russia.
A curtain aurora is observed from Greenland in 1861. Caused by high-speed particles ejected from the Sun, they are most commonly observed during periods of maximum sunspots. From a chromolithograph entitled 'Die Naturkrafte' by M. Wilhelm Meyer (Leipzig, 1903).
An image taken by NASA's Solar Dynamics Observatory (SDO) and released late this week shows the sun letting loose with one of its most powerful explosions, an X-class solar flare, the largest in four years. The flare is the bright prominence in the southern hemisphere. Solar flares affect Aurora Borealis.
Looking like a massive fireworks display, this spectacular northern lights photo shows the green and purple colors rippling across the Arctic sky over Norway.
Lava poured out of two fissures near Eyjafjallajokull, Iceland in 2010, as the Aurora Borealis appeared through the frigid night sky, east of Reykjakik.
Aurora Borealis is seen in the distance on this beautiful night over England. This picture, taken by an astronaut on the International Space Station, shows London and Paris lit up at night, the southern Mediterranean including Ibiza and Majorca, and the green northern lights spread out across the top of the earth above Britain.
Among the views of Earth afforded astronauts aboard the International Space Station (ISS), surely one of the most spectacular is of the aurora. These ever-shifting displays of colored ribbons, curtains, rays, and spots are most visible near the North (Aurora Borealis) and South (Aurora Australis) Poles as charged particles (ions) streaming from the Sun.
Aurora borealis is seen at midnight, east of Boise, Idaho.
The Aurora Borealis is caused by an atmospheric disturbance in the ionosphere, as a result of solar rays from the sun. During particularly strong sun storms, scientists can predict an aurora.
Brilliant blue and green Aurora Borealis lights up clouds and the landscape around Mt. Snowden in the Brooks Range in Alaska.
An aurora is observed from the Japanese icebreaker Shirase in the Antarctic Sea on Feb. 22, 2011.
NASA's Hubble Space Telescope photographed this close-up view of an electric-blue aurora that is eerily glowing one half billion miles away on the giant planet Jupiter.