The Arctic Circle is an imaginary line around the Earth at about 66°33' North Latitude this defines the boundary of the Arctic. It marks the start of the area where, for at least one day each year, the sun does not completely set June 21 or rise December 22.
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Other Resources:
http://nsidc.org/arcticmet/basics/arctic_definition.html

http://fairbanks-alaska.com/arctic-circle.htm

http://starchild.gsfc.nasa.gov/docs/StarChild/
solar_system_level2/earth.html

Auroras, sometimes called the northern and southern (polar) lights or aurorae (singular: aurora), are natural light displays in the sky, usually observed at night, particularly in the polar regions. They typically occur in the ionosphere. They are also referred to as polar auroras. In northern latitudes, the effect is known as the aurora borealis, named after the Roman goddess of dawn,
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Other Resources:
http://www.athropolis.com/arctic-facts/fact-nlights-cause.htm

http://www.arcticcircle-information.fi/northernlights.html

http://www.pa.msu.edu/sci_theatre/ask_st/062492.html

Polar exploration is the physical exploration of the Arctic and Antarctic regions of the Earth. It is also denotes the historical period during which mankind most intensely explored the regions north of the Arctic Circle and south of the Antarctic Circle. Humankind has explored the north and south extremes since 325 BCE, although physical contact with remote areas, including much of the Antarctica continent, has only occurred since 1900.
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Other Resources:
http://www.normanphillips.co.uk/
david_hempleman_adams_bio.htm

http://www.gordonpoole.com/?artistID=539

http://www.enchantedlearning.com/
explorers/arctic.shtml