By Stuart Clark
ISBN-10: 1623652073
ISBN-13: 9781623652074
The large Questions sequence allows well known specialists to take on the 20 such a lot primary and regularly requested questions of a massive department of technology or philosophy. each one 3000-word essay easily and concisely examines a query that has without end at a loss for words enquiring minds, delivering solutions from history's nice thinkers. This bold venture is a different distillation of humanity's most sensible principles. In immense Questions: The Universe, Dr Stuart Clark tackles the 20 key questions of astronomy and cosmology: what's the universe? How mammoth is the universe? How outdated is the universe? What are stars made of? How did the Universe shape? Why do the planets remain in orbit? was once Einstein correct? What are black holes? How did the Earth shape? What have been the 1st celestial items? what's darkish subject? what's darkish strength? Are we actually made up of stardust? Is there lifestyles on Mars? Are there different clever beings? do we commute via time and house? Can the legislation of physics swap? Are there replacement universes? what's going to be the destiny of the universe? Is there cosmological facts for God?
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Additional resources for The Big Questions: The Universe
Sample 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 Big Questions: The Universe by Stuart Clark
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