Are The Planets Inhabited? - download pdf or read online

By E. Walter Maunder

(Edward) Walter Maunder (12 April 1851 – 21 March 1928) was once a British astronomer most sensible remembered for his examine of sunspots and the sunlight magnetic cycle that ended in his identity of the interval from 1645 to 1715 that's referred to now because the Maunder minimal.

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Extra resources for Are The Planets Inhabited?

Sample text

But though we now can dismiss from our minds the possibihty that the Sun can be inhabited, yet it is of such importance to the maintenance of life on this planet, and by parity of reasoning to hfe on any other planet, that a review of its conditions forms a necessary introduction to our subject. Further, those conditions ' themselves will bring out certain principles that are of necessary application when we come to consider the case of particular planets. The distance of the Sun from the Earth is often spoken of as the " astronomical unit " it is the fundamental measure of astronomy, and all our ; information as to the sizes and distances of the various planets rests upon it.

Its surface exceeds that of the Earth its volume, 1,310,000 times. 11,970 times But the weight of the Sun is known as well as its size this follows as a consequence of gravitation. For the planets move in orbits under the influence of the Sun's attraction the dimensions of their orbits are known, and the times taken in de; ; ; scribing them therefore the Sun. is ; also This the amount of the attractive force known, that is is to say, the mass of 332,000 times the mass of the THE SUN Earth and as the ; latter has been determined as equal to about 6,000,000,000,000,000,000,000 tons that of the Sun would be equal to 2,000,000,000,000,000,000,000,000,000 tons.

In 1897, on September 21, the late Major Molesworth noticed that the crater was at that time under the rays of the setting Sun, and filled with shadow, and the inner terraces, which should have been invisible, were seen as faint, knotted, glimmering streaks under both the eastern and western walls, and the central peak was also dimly discernible. He thought this unusual lighting up of rocks on which the Sun had already set might be due either to phosphorescence produced by long exposure to the Sun's rays, or to inherent heat, or to reflected glare from the v/estern rampart.

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Are The Planets Inhabited? by E. Walter Maunder


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