NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Aircraft contrails over Canadian lakes, seen from the International Space Station (ISS). Contrails are artificial clouds formed from frozen water droplets from the exhaust of the engines of an aircraft. They are formed when the aircraft is flying at an altitude of over 5000 metres and when the upper atmosphere is nearly saturated with moisture. In dry air, the contrails will evaporate quickly. The lakes (shining by reflected sunlight) are part of Quetico Provincial Park, Ontario. The area lies north of Lake Superior. Many of Canada's numerous lakes were created by glacial action. The ISS orbits the Earth at an altitude of around 380 kilometres. Photographed on 17 August 2003.
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