Postcard from USA.

Northern lights in Alaska.

Auroras are natural light displays in the sky, usually observed at night and can be incredibly bright, multihued and fast moving. The most common color is a brilliant yellow-green. Colorful northern lights displays can produce red, blue and purple patterns. Displays usually occur about sixty or seventy miles above the earth’s surface at speed up to 35,000 miles per hour  - about ten times higher than a jet aircraft flies - and can extend hundreds of miles into space.

Thank you Magnus for the dazzling postcard with beautiful stamps.

1982 Stamp-Knoxville World's Fair

2009 Stamp-Teton National Park