Alpha Centauri - The Nearest Star by Isaac Asimov PDF
By Isaac Asimov
Discusses the constellations and stars, the gap, luminosity and measurement, stellar astronomy, starlight, and existence on different planetary platforms, with specific connection with the 3rd brightest and likewise the closest superstar. Alpha Centauri.
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Extra resources for Alpha Centauri - The Nearest Star
The more rapidly they moved, the closer to us they must be. (Thus, we know in our own experience, an airplane moving overhead rather close to us seems to zoom past at a great rate while another airplane, a great distance overhead, seems to move slowly across the sky, even though it may be moving more rapidly, in actual fact, than the nearby plane. ) Judging by the speed of motion, the ancients judged the planetary system to be arranged in the following manner, in the order of increasing distance from Earth: Moon, Mercury, Venus, Sun, Mars, Jupiter, and Saturn.
By the end of the 1600s both the distances and the sizes of the planets were determined and the original notion that their magnitudes depended on both distance and size was confirmed. Well, then, what about the stars? The planets increase in size when looked at through the 56 • ALPHA CENTAURI, THE NEAREST STAR telescope so on. and seem The stars, like little circles, ellipses, crescents, however, do not. They become brighter viewed through the telescope, but are still and when so small that they seem only points of light.
Alpha Centauri? Because Alpha Centhird, — tauri is located so far to the south on the celestial sphere that had made no observations of its position which Halley could then compare to modern observations. Later observations soon revealed Alpha Centauri's motion, however, for it shifted position so quickly that its motion the Greeks could be detected in very little time. 7 in second place. If an indication of the closeness would seem that Alpha Centauri may be the nearest of the bright stars. Then, if brightness is itself an indication of closeness, and if no dim star can possibly be as of a star, it 6o • ALPHA CENTAURI, THE NEAREST STAR close to US as a bright star the nearest of But wait !
Alpha Centauri - The Nearest Star by Isaac Asimov