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How the System Holds Together
The Discoveries of Neptune and Pluto
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000 Conjunction 000 Morning ammonia angle areas asteroids astronomical unit attraction bodies bright changes clouds color Conjunction with Sun craters dark density diameter disc E. C. Slipher Earth Earth's atmosphere eclipse equator force gases gravity Harvard Observatory heat hydrogen infrared Jupiter Jupiter's layer less Lick Observatory light Lowell Observatory lunar Mare Imbrium Mars Martian mass measured Mercury meteoric methane miles per second Moon Moon's surface motion Mount Wilson Observatory mountain moving nearly Neptune Neptune's observed Opposition to Sun orbit outer oxygen P-wave parallax Percival Lowell period Photographs by E. C. Planet Finder planetary Pluto polar caps pole position predicted produce rays reflected revolution rings rocks rotation S. B. Nicholson satellites Saturn seen Sept solar system space spectrograph star Sun's sunlight TABLE 4 Continued telescope temperature terrestrial theory tidal tides tion ultraviolet Uranus velocity Venus volcanic water vapor