Word: orbits
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Dates: during 1920-1929
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...atoms, which we used to think of as hard and indivisible, so large that it became a yard in diameter, nothing would yet be appreciable, because its electron would still be only a pinhead in size and its nucleus 2,000 times smaller. So while you might distinguish the orbit, its planet [electron] and sun [nucleus] would still be nearly invisible. In other words, practically all of the hydrogen atom is apparently space . ." .as empty as the sky, almost as empty as a perfect vacuum. . . . Atoms begin to look like solar and planetary systems with different groups of positive...
...about 25% larger than Betelgeuse. It is believed to be about 165 light years distant, which makes its diameter about 250,000,000 miles. Only one larger star, Antares, has been measured.* Therefore, if the centre of Mira were where the center of our Sun is, the orbit of the Earth would be some 25,000,000 miles inside the surface of Mira...
...like a halo. Meanwhile, the sky is darkened and the stars are visible. Near the moon, and west of it, will appear a group of three planets, Venus nearest, then Mercury and farthest Jupiter. To be able to see Mercury with the naked eye is very rare, for its orbit is so near the sun that it is usually obscured by light when the latter...
Mars is the planet whose orbit lies just outside that of the earth. Its mass is about one-ninth that of the earth. Its atmosphere has probably less than one-seventh the density of that of the earth. Because of its smaller mass, its gravity is much less and objects on its surface weigh only about one-third as much as the same objects would on the surface of the earth. It has also distinct polar caps, which increase and decrease with seasonable variations. It has also no marked clouds in its atmosphere. It has no surface elevations probably...
...electrons, which, like any other current of electricity, become magnets when moving in circles. They travel in pairs, 180 degrees apart, neutralizing each other, and thus holding together all chemical compounds. Instead of the Bohr atom with its positive nucleus, Dr. Lewis claimed that the electrons, though having orbits, do not revolve around the "kernel" of the atom. No one has been able to work out a satisfactory path for these paired electronic orbits, but that fact does not bother the chemists so much as the physicists. Instead of a general orbit for all, like the rings of Saturn, each...