The Universe and the Atom

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THE UNIVERSE AND THE ATOM
Don Lichtenberg
Indiana University, Bloomington, USA
2007 by World Scientific Publishing Co. Pte. Ltd
pages 312

توضیحات

The Universe and the Atom

.We are, of course, made of flesh and blood, bones and hair, and
we live on the earth. But on a smaller scale our bodies are made
of cells, and the cells are made of molecules. In turn, the molecules
are made of atoms, and atoms are made of electrons and atomic nuclei
As far as we know, the electrons are elementary in the sense
that they are not composed of smaller things. However, atomic nuclei
are made of protons and neutrons, which in turn are made of
quarks. That is where our present understanding of the nature of
matter ends, although there are speculations about even deeper levels.
On a larger scale, the earth is the third planet from the sun in our
solar system, and the solar system is in our galaxy, the Milky Way,
which is a system of more than a hundred billion stars plus dust and
other kinds of matter held subject to their mutual gravitational attraction.
The Milky Way in turn is only one galaxy (system of stars)
of many billions of galaxies that exist in the visible universe. And
there have been speculations about what lies beyond the visible universe
and whether we can ever know anything about it.
We are about to take a journey into the world of the very small
and the world of the very large. What we shall find will be so foreign
to our senses and so much against our intuition as to be almost beyond
belief. Mankind has long thought about what matter is made
of and what the universe is like. However, it was not until the twentieth
century that our knowledge has grown so much that today we
have a largely coherent picture at what nature is like at both large
and small scales