... Iridescent Clouds from the Top of the World Highway . ... Credit Copyright: Charles Stankievech Sophie Springer Explanation: Why would a cloud appear to be different colors? A relatively rare phenomenon known as iridescent clouds can show unusual colors vividly or a whole spectrum of colors simultaneously. ... This iridescent cloud was photographed last year from the Top of the World Highway outside Dawson City , in the Yukon Territory in Northern Canada . ... NASA Official: Jay Norris. ...