By Don Lichtenberg
ISBN-10: 9812706062
ISBN-13: 9789812706065
This can be a attention-grabbing and well known account of the very huge and the very small, from the universe as an entire to subatomic physics. It contains qualitative factors of quantum mechanics and relativity, the massive bang with inflation, the synthesis of components, atoms, nuclei, subnuclear physics, quarks, leptons, and different straightforward debris. It additionally offers an account of darkish subject and darkish power. In precis, it offers and review of what we all know concerning the universe and what it's made up of, and in addition what we don't comprehend.
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Example text
GALILEO’S CONTRIBUTIONS 17 around its axis in the same direction as the planets revolve around the sun. The sun and the planets are said to have “angular momentum,” a concept discussed in Chapter 7. 2 Galileo’s contributions Galileo Galilei (1564–1642), an Italian, was a contemporary of Kepler and the first great “modern” physicist. ) Galileo made revolutionary changes in our ideas of motion as well as our ideas about astronomy. He and Kepler both observed the supernova of 1604, an object that suddenly brightened in the sky.
Ignoring the problem of how life can exist in two dimensions (we believe it can’t), let us examine the perception of a two-dimensional being observing a sphere passing through his plane. The sphere looks like a point as it just touches the plane, then becomes a small circle which grows to a maximum size, shrinks again to a point, and then disappears. The two-dimensional being observing the sphere from the outside will not see a point become a circle but will see it become a line, grow, and then shrink again until it disappears.
We say that the circle has a symmetry that leaves it looking invariant under any rotation between zero and 360 degrees. 26 CHAPTER 3. NEWTON’S IDEAS ABOUT SPACE AND TIME No other two-dimensional curve has as much symmetry. For example, a square has a symmetry through a rotation of 90 degrees and multiples thereof, but under a rotation of less than 90 degrees, the length of the externally observed line will change. We in three dimensions cannot really see a whole sphere, but it appears to us only as a disk.
The Universe and the Atom by Don Lichtenberg
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