Astronomy Picture of the Day . ... 12.06.2007 . ... Credit: NASA , Ken Thornsley Explanation: What kind of cloud is that? ... Pictured above is the drifting smoke plume left over from last Friday's launch of the Space Shuttle Atlantis . The twisted plume was captured shortly after launch high above NASA's massive Vehicle Assembly Building , the largest single story building in the world. Rockets frequently create picturesque plume s during launch. ... U. Based on Astronomy Picture Of the Day ...