03. How heavy is Earth? (A K2S Question)

From The Space Library

Our planet has a mass of about 6,000,000,000,000,000,000,000 tons, so you would think it must be tough trying to weigh it. Scientists can figure it out, though, from its orbit and size, among other things.

Answer provided by Derek Webber

Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

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