A short history of nearly everything - Bill Bryson [271]
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*2Properly called the Öpik-Oort cloud, it is named for the Estonian astronomer Ernst Öpik, who hypothesized its existence in 1932, and for the Dutch astronomer Jan Oort, who refined the calculations eighteen years later.
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*3Triangulation, their chosen method, was a popular technique based on the geometric fact that if you know the length of one side of a triangle and the angles of two corners, you can work out all its other dimensions without leaving your chair. Suppose, by way of example, that you and I decided we wished to know how far it is to the Moon. Using triangulation, the first thing we must do is put some distance between us, so let's say for argument that you stay in Paris and I go to Moscow and we both look at the Moon at the same time. Now if you imagine a line connecting the three principals of this exercise—that is, you and I and the Moon—it forms a triangle. Measure the length of the baseline between you and me and the angles of our two corners and the rest can be simply calculated. (Because the interior angles of a triangle always add up to 180 degrees, if you know the sum of two of the angles you can instantly calculate the third; and knowing the precise shape of a triangle and the length of one side tells you the lengths of the other sides.) This was in fact the method use by a Greek astronomer, Hipparchus of Nicaea, in 150 B.C. to work out the Moon's distance from Earth. At ground level, the principles of triangulation are the same, except that the triangles don't reach into space but rather are laid side to side on a map. In measuring a degree of meridian, the surveyors would create a sort of chain of triangles marching across the landscape.
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*4How fast you are spinning depends on where you are. The speed of the Earth's spin varies from a little over 1,000 miles an hour at the equator to zero at the poles.
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*5The next transit will be on June 8, 2004, with a second in 2012. There were none in the twentieth century.
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*6In 1781 Herschel became the first person in the modern era to discover a planet. He wanted to call it George, after the British monarch, but was overruled. Instead it became Uranus.
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*7To a physicist, mass and weight are two quite different things. Your mass stays the same wherever you go, but your weight varies depending on how far you are from the center of some other massive object like a planet. Travel to the Moon and you will be much lighter but no less massive. On Earth, for all practical purposes, mass and weight are the same and so the terms can be treated as synonymous, at least outside the classroom.
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*8There will be no testing here, but if you are ever required to memorize them you might wish to remember John Wilford's helpful advice to think of the eras (Precambrian, Paleozoic, Mesozoic, and Cenozoic) as seasons in a year and the periods (Permian, Triassic, Jurassic, etc.) as the months.
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*9Although virtually all books find a space for him, there is a striking variability in the details associated with Ussher. Some books say he made his pronouncement in 1650, others in 1654, still others in 1664. Many cite the date of Earth's reputed beginning as October 26. At least one book of note spells his name “Usher.” The matter is interestingly surveyed in Stephen Jay Gould's Eight Little Piggies.
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*10Darwin loved an exact number. In a later work, he announced that the number of worms to be found in an average acre of English country soil was 53,767.
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*11In particular he elaborated the Second Law of Thermodynamics. A discussion of these laws would be a