A lucky star or constellation is a group of stars that appear to relate a specific configuration. In three-dimensional space, most of the stars that we observed does not have relationships with one another, but can seem to gather the ball in the night sky. Humans have a very high ability in recognizing patterns and groups throughout history have been the stars that appear close to a constellation constellation-stars. Lucky stars that the order is not official, that is recognized by knowledgeable people, but not recognized by the experts or Astronomy Astronomy Association International, also called asterisma. Stars or stars in the constellation asterisma who rarely have any relationship astrofisika; their only chance only appear in the sky near the visible from Earth and are very much separate.
The stars of a constellation stars actually quite random, and different cultures will have a constellation of stars are different, even though some of the very easily recognizable usually often found, such as Orion or the Scorpion.
Astronomy has been the International Association divides the sky into 88 official constellation stars with boundaries that clearly, so that each direction is only owned by one lucky stars only. In the hemisphere (hemisfer) north, most of the constellation star it based on the Greek tradition, which is inherited through the Middle Century, and the zodiac symbols.
Various other patterns that do not have any official with the stars and constellation called asterisma, such as the plow (also known in the United States as the Big Dipper) and the Little Dipper
Source:
http:id.wikipedia.org
