To the ordinary eyes, the night sky is simply a moon and bunch of bright lights but to the trained observer, there are not jest stars up there he/she can look up and distinguish near planets, satellites and stars, without the help of a telescope or any other tool other than his eyes and brains. We may also look at a cloud and jest see a giant piece of cotton however anyone in the field of geography can tell you there is a great significance in the shape witch allows us to tell the difference between a cumulonimbus (http://en.wikipedia.org/wiki/Cumulonimbus_cloud) and a stratus (http://en.wikipedia.org/wiki/Stratus_cloud)
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