The night sky over the Grand Teton National Park in Wyoming, USA. The bright summer Milky Way appears on the left from Scorpius and Sagittarius to Aquila and Cygnus (top). In the lower middle is the bright star Arcturus. The green bands are airglow; natural emission of the Earth upper atmosphere. The Teton Range is a part of the Rocky Mountains. The Grand Teton, the tallest mountain in the range, is 13,775 feet (4,199 m) high.