Famous arrangement not a constellation, however
This week, as darkness descends, the stars of the Big Dipper are almost directly overhead.

Next to Orion, the Dipper is probably the most impressive group of stars in our sky. Here we have seven bright stars, which give us quite a convincing tin dipper with its handle bent downwards. Yet we could easily imagine with our friends in England that it represents a plough, or we could liken it to a chariot or some other sort of wagon as people of many nations have done from the earliest times.
The International Astronomical Union all officially approves the constellations shown on modern star atlases, but while constellations are official, asterisms are not. An asterism is often defined as a noteworthy or striking pattern of stars within a constellation, but that is not always the case.
The Big Dipper is not a constellation itself, but an asterism, which is part of the larger constellation of Ursa Major, the Great Bear. What is remarkable is that these stars comprised a bear to widely separated early — not only to Old World ancients but New World Native American tribes as well. The bear's nose is 3rd-magnitude Muscida, a corruption of the Latin musus, meaning muzzle. The bear's paws known to early Arabs as the "Leaps of the Gazelle" are marked by an almost equally spaced set of three pairs of stars. The Dipper's bowl is the torso.

But how to explain the abnormally long tail, marked by the Dipper's handle?
British writer Thomas Hood (1799-1845) speculated:
"Imagine that Jupiter, fearing to come too nigh unto her teeth, lay hold on her tail, and thereby drew her up into the heaven; so that she of herself being very weighty, and the distance from the earth to the heavens very great, there was great likelihood that her tail must stretch. Other reason know I none."
http://www.msnbc.msn.com/id/8175319/












