By Isaac Asimov
В этой книге рассказано о развитии знаний о космосе с древнейших времен до наших дней, об эволюции Вселенной, о рождении Солнечной системы, возникновении жизни на Земле. Все это рассматривается в тесной связи со сверхновыми.
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Extra resources for The Exploding Suns
42 for Sirius, the next brightest star. 512-fold increase in brightness. Therefore, the Sun shines in our sky with a brightness fifteen billion times that of Sirius. However, our Sun is also incomparably the nearest star in the sky. 000005 parsecs. 65 parsecs away and is, therefore, 530,000 times as far away from us as the Sun is. Suppose, now, that we viewed the Sun and Sirius from the same distance. ) If we imagined the Sun to be ten parsecs away, it would be two million times as far away as it is.
What he did confirm, in 1609, was that Mars did not move about the Sun in a circle or in a combination of circles as Plato had insisted and as all subsequent Western astronomers, in cluding Copernicus, had supposed. Mars moved around the Sun, instead, in an elliptical orbit with the Sun at one 25 The Exploding Suns focus. Kepler went on to show that all the planets moved in elliptical orbits. In doing this, Kepler had finally worked out the ac tual description of the solar system. His system, and not that of Copernicus, fit reality.
With it, Galileo did something new and dar ing-he turned it on the sky. Galileo's telescope was a small and primitive affair, but it was the first time anyone had ever scanned the night sky with something more than the unaided eye. The telescope gathered more light than the eye itself could, and it focused that increased quantity of light on the ret ina. As a result, everything looked larger or brighter or both. The Moon looked larger and showed more detail. So did the Sun, if one took precautions against being blinded by it.