Thursday, 21 August 2014

The earliest definition of the word "planet" considered the moon and the sun planets, and not Earth. But the definition evolved over time, eventually including Earth and removing Pluto out of the Solar System's planet lineup.
Photo: The earliest definition of the word "planet" considered the moon and the sun planets, and not Earth. But the definition evolved over time, eventually including Earth and cutting Pluto out of the Solar System's planet lineup. Why is Pluto no longer considered a planet? Should it be?: http://bit.ly/IsPlutoPlanet
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