By E. Walter Maunder
(Edward) Walter Maunder (12 April 1851 – 21 March 1928) was once a British astronomer most sensible remembered for his learn of sunspots and the sun magnetic cycle that resulted in his id of the interval from 1645 to 1715 that's referred to now because the Maunder minimal.
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Extra info for Are The Planets Inhabited?
Sometimes a prominence of these, or even greater, dimensions has formed, developed, risen to a great distance from the Sun, and completely disappeared within less than half an hour. The velocity of the gas streams in such eruptions often exceeds one hundred miles a second sometimes, though only rarely, it reaches a speed twice ; as great. Sunspots do not offer us examples of motions of but the areas which they affect are not less astonishing. Many spot groups have been seen to extend over a length of one hundred thousand, or one hundred and fifty thousand miles, and to cover a total area of a thousand million square miles.
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. be seen that the proportion of the volume of the Sun to that of the Earth is greater than the proportion of its mass to the Earth's mass almost It will — exactly four times greater; so that the mean density of the Sun can be only one-fourth that of the Earth.
Between the heaven and man came the cloud. "* The leaf able world. and the cloud are the signs of a habitThe leaf that is to say, plant hfe, — — vegetation is necessary because animal life is not capable of building itself up from inorganic material. This step must have been previously taken by the plant. The cloud, that is to say water-vapour, is necessary because the plant in its turn cannot directly assimilate to itself the nitrogen from the atmosphere. The food for the plant is brought to it by water, and it assimilates it by the help of water.