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How many planets are there in our solar system? The answer hasn’t always been 9 … er, I mean 8 (sorry Pluto!). The count has changed throughout history as we got a better understanding of astronomy, discovered new planets, and redefined what a ‘planet’ is. Wouldn’t it be helpful to […]
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This post was kindly contributed by SAS Learning Post - go there to comment and to read the full post. |