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Nonfiction » Science and Nature » Astronomy

The Sidewalk Solar System    by Richard Ignace
Price: Free! 1030 words. Language: English. Published on January 14, 2010. Nonfiction » Science and Nature » Astronomy.

(5.00 from 1 review)
For elementary and middle school level children, this is an activity for making a model of the solar system that is to scale using only chalk and a long stretch of sidewalk. It is fun for the entire class, helps children think in terms of models, and helps them learn about the planets.
Leaving the Planet by Space Elevator    by Philip Ragan
Price: $1.99 USD. 40270 words. Language: English. Published on November 17, 2010. Nonfiction » Science and Nature » Cosmos.

(5.00 from 1 review)
The seminal work on the Space Elevator by the controller of the project from the 1990's, together with a Foreword by the late Sir Arthur C Clarke, this explains the Space Elevator concept, how it works, when it will be deployed, and all the detail that goes with it.