constellations
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Constellations
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What is a constellation?
A constellation is a group of stars that are connected together to form a figure or picture.
• The term is also used to mean any group of stars visibly related to each other
• Considered as a fixed configuration or pattern in a particular culture.
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• The International Astronomical Union (IAU) divides the sky into 88 official constellations with exact boundaries, so that every direction or place in the sky belongs within one constellation.
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• Northern hemisphere- constellations based upon the constellations of the ancient Greek tradition, containing the signs of the zodiac
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• A star pattern may be widely known but may not be recognized by the International Astronomical Union; such a pattern of stars is called an asterism.
• An example is the grouping called the Big Dipper.
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• The grouping of stars into constellations is essentially arbitrary and random
• Different cultures have had different constellations, although a few of the more obvious ones tend to recur frequently, e.g., Orion and Scorpius.
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• In space, most of the stars we see have little or no relation to one another, but can appear to be grouped in the night sky.
•The stars in a constellation rarely have any astrophysical relationship to each other; they just happen to appear close together in the sky as viewed from Earth; they typically lie many light-years apart in space. One exception to this is the Ursa Major.
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http://joemorris.mystarband.net/images/Orion%20Constellation.jpg
Some well-known constellations contain striking and familiar patterns of bright stars.
Examples: Orion (containing a figure of
a hunter) Leo (containing bright stars
outlining the form of a lion)
Scorpius (a scorpion)Crux (a cross).
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