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The Giant Planets   [10]
The Giant Planets [10]

... Galileo mission to Jupiter (1995) • Orbiter, still studying Jupiter’s moons. • Probe, parachuted into atmosphere • Studied, as function of altitude: • Penetration of sunlight ...
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Your Life on Other Planets Lab

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Life and Earth Science Vocabulary 2015

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... of the orbit of Mars • So, by measuring the amount of time it takes Mars to travel from point “A” to point “B” each orbit, Copernicus was able to determine the size of the orbit of Mars (and of Jupiter, Saturn, Mercury, and Venus). ...
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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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