Paul Geiger
Author
Language
English
Description
For more than 40 years astronomers have known the planets do not revolve around the Sun in flat orbits, as they used to believe. One of nature's many optical illusions had misled them for hundreds of years. In the 1960s astronomers were studying the orbital motions of stars in other galaxies and realized the Sun must be moving in an orbit around the center of the Milky Way. This requires each planet in the Solar System to follow a helical (spiral)...
Author
Language
English
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Description
Who could forget the pranks, the adventures, the sheer fun of Tom Sawyer? It's something every child should experience and every child will love. From Tom's sly trickery with the whitewashed fence, when he cleverly manipulates everyone so they happily do his work for him, to his and Becky Thatcher's calamities in the Bat Cave, the enjoyment just never ends.