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Learning About Stars
Learning About Stars

... http://www.redorbit.com/modules/reflib/article_images/6_15cc05865f89c4801c5ff2a85d74a93c.jpg ...
View the presentation slides
View the presentation slides

1 Dr. Steve Hawley Volume 35 Number 04 APRIL 2009
1 Dr. Steve Hawley Volume 35 Number 04 APRIL 2009

ASTRONOMY 113 Laboratory Kepler`s 3rd Law and the Mass of Sgr A
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... Kepler’s laws describe the orbits of planets, comets, and asteroids perfectly, but the fundamental cause of these laws was not clear when Kepler discovered them. It was Newton who finally solved this question by discovering the law of gravity, which is at the root of all three laws. In the first par ...
Wilmslow Guild Lecture 2008
Wilmslow Guild Lecture 2008

... cataclysmic explosion of a singularity 0.000000000000000000000000003 (2 x 10-27) metres in diameter (much smaller than the diameter of an atom). After just 0.00000000000000000000000000000000001 (10-35) seconds, when the temperature of the nascent universe was ten thousand trillion, trillion degrees ...
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sample - Scholastic

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PowerPoint プレゼンテーション

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second sun - royal device
second sun - royal device

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Orrery



An orrery is a mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; but since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery — whence came the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.
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