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Updated: June 24, 2025
It was more than seven times as far as Sirius, nearly fourteen times as far as Alpha Centauri, three times as far as Vega, and twice as far as Arcturus. But some geologists demand two hundred, three hundred, even one thousand million years to enable them to account for the evolutionary development of the earth and its inhabitants.
Klinkerfues, of Göttingen, telegraphed to Pogson, of Madras: ``Biela touched earth; search near Theta Centauri. Pogson searched in the place indicated and saw a cometary mass retreating into the southern heavens, where it was soon swallowed from sight!
"Mason," yelled Loring, "you take over on the radar bridge!" "All ready up here," said Mason. "Well, be sure we've got a clear trajectory out. Better take us into the sun Alpha Centauri. That way, maybe they'll miss us on their radar. The sun will show all sorts of blips on their screen." "O.K.," said Mason. "You think he'll go for it?"
At each step, as it were, that the explorers made, fresh stars entered the field of their vision. The magnificent constellations of the southern sky shone resplendently. At the zenith glittered the splendid Antares in the Scorpion, and not far was Alpha Centauri, which is believed to be the nearest star to the terrestrial globe.
Omega Centauri and the Hercules cluster are especially remarkable in this respect. The variables found in them are all of short period and the changes of light show a noteworthy tendency to uniformity.
Immediately an image of Earth and its Moon, and much farther away the sun, was visible. Connel stepped to the screen and pointed to Moon. "The Moon is a captive satellite of Earth, revolving around Earth the same way Earth revolves around the sun. It's the same situation we have here. This satellite is a captive of Tara, and Tara is a captive of Alpha Centauri.
Though the weather was cloudy I succeeded in obtaining some heights of alpha Centauri, serving to determine the latitude of the place; which is 8 degrees 37 minutes 57 seconds. Some altitudes of the sun gave me 67 degrees 8 minutes 12 seconds for the longitude, supposing Angostura to be 66 degrees 15 minutes 21 seconds.
He could see two large oceans, the green-blue of the water reflecting the sunlight of Alpha Centauri brilliantly. Nearer and nearer the Polaris plummeted, and Tom could begin to distinguish the rough outline of mountain ranges along the horizon line. He switched to a larger view of the planet on the magnascope that revealed a splendor rivaling the beauty of his own cherished Earth.
But Bessel's observations, between 1837 and 1840, of 61 Cygni, a star with the large proper motion of over 5", established its annual parallax to be 0".3483; and this was confirmed by Peters, who found the value 0".349. Later determinations for alpha2 Centauri, by Gill, make its parallax 0".75 This is the nearest known fixed star; and its light takes 4 1/3 years to reach us.
Alpha Centauri, our nearest neighbor, if we can use such a word as "near" in speaking of its distance, has a spectrum very like that of our sun, and so has Capella. But even in these cases careful examination shows differences. These differences arise from variety in the combinations and temperature of the substances of which the star is made up.
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