13 Things That Don't Make Sense: The Most Intriguing - download pdf or read online

By Michael Brooks

ISBN-10: 1847651305

ISBN-13: 9781847651303

ISBN-10: 186197647X

ISBN-13: 9781861976475

Technology starts off to get attention-grabbing whilst issues dont make experience. Michael Brooks finds 13 anomalies that defy the medical idea of at the present time and forecast tomorrows breakthroughs.

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But it was a controversial finding. 3. Had everyone underestimated the amount of dark matter? It seemed unlikely; by this time various different methods for determining the mass of galaxies were in use, and each showed there was significantly more gravitating matter than we could see, and each gave approximately the same numbers. If dark matter was on a fairly solid footing, what was going on? The cosmologists Michael Turner and Lawrence Krauss were at the Princeton meeting, and they had an answer ready.

The Earth, in its position close to the Sun, moves much faster in its orbit than Neptune, which is farther out. The reason is simple: it’s about balancing forces. The gravitational pull of the Sun is stronger at Earth’s radial distance out from the Sun than at Neptune’s. Something with Earth’s mass has to be moving relatively fast to maintain its orbit. For Neptune to hold its orbit, with less pull from the distant Sun, it goes slower to keep in equilibrium. If it moved at the same speed as Earth, it would fly off and out of our solar system.

When these velocity measurements were published in the Proceedings of the American Philosophical Society, no one made much of them, and Slipher certainly wouldn’t be so vulgar as to seek attention for his work. Hubble, though, had obviously not forgotten about it. He asked Slipher for the data so as to include them in a book on relativity, and, in 1922, Slipher sent him a table of nebular velocities. By 1929 Hubble had pulled Slipher’s observations together with those of a few other astronomers (and his own) and come to a remarkable conclusion.

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13 Things That Don't Make Sense: The Most Intriguing Scientific Mysteries of Our Time by Michael Brooks

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