Stock Photo - An oblique view of the Arnica Fire in Yellowstone National Park, Wyoming, is featured in this image photographed by an Expedition 20 crew member on the International Space Station (ISS). The late summer-fall wildfire season is in full swing in the western United States. Significant wildfires are observed each year by astronauts orbiting Earth from the International Space Station. This photograph documents the Arnica Fire in Yellowstone National Park. The fire was started by a lightning strike near Lake Yellowstone on Sept. 13, 2009. By the time it was detected on Sept. 23, it covered approximately two hectares (four acres). The fire was photographed by the crew members on the following day (Sept. 24); by then, it had grown to 101 hectares (250 acres) in size. Warm, dry and windy conditions in the area provided a favorable environment for growth of the fire and as of Oct. 1, 2009 the fire was estimated to be 3,764 hectares (9,300 acres) in size. The ISS was approximately above Lake Winnipeg, Manitoba, Canada - almost 1200 kilometers to the northeast of the fire - when this image was taken using a long lens. The image is highly oblique, or taken looking outwards at an angle, from the ISS rather than straight down (nadir viewing) towards Earth's surface. Landmarks visible in the image include Lakes Yellowstone and Jackson at center; the Teton Range is visible in the background.