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Updated: June 25, 2025
But though we can thus minimize the dangers and the inconveniences arising from the grosser forms of dust, we cannot wholly abolish it; and it is, indeed, fortunate we cannot do so, since it has now been discovered that it is to the presence of dust we owe much of the beauty, and perhaps even the very habitability of the earth we live upon.
But, as it was, I was very lonesome, and whatever consolation I got from my reasoning about the planet's habitability was increased a thousand fold by seeing a speck upon the horizon, which I hoped might prove to be a sail. I watched it with intense interest, and was not disappointed.
Thus far we have found so much of brilliant promise in the earth's twin sister that I almost hesitate to approach another phase of the subject which may tend to weaken the faith of some readers in the habitability of Venus.
Much less was there any attempt yet by Thorwald to resume the argument about the habitability of other worlds. But at the same time we were aware that our friends were at our service, and early in the afternoon Thorwald asked us if we could think of anything we should like to see. "Yes," I answered, "I should like to see the earth."
The first champion of the habitability of Mars was Sir William Herschel, although even before his time the idea had been suggested. He was convinced by the revelations of his telescopes, continually increasing in power, that Mars was more like the earth than any other planet.
Indeed, these primary conditions of fertility and large habitability appertain to America, as a whole, to such degree, that, with less than half the extent of the Old World, it actually numbers more acres of fertile soil, and can, of course, sustain a larger population. Unity.
The reader will remember that Mars gets a little less than half as much heat from the sun as the earth gets. This fact also has been used as an argument against the habitability of the planet.
Even while granting the worst that can be said for the low temperature of Mars, the persistent believer in its habitability could take refuge in the results of recent experiments which have proved that bacterial life is able to resist the utmost degree of cold that can be applied, microscopic organisms perfectly retaining their vitality or at least their power to resume it when subjected to the fearfully low temperature of liquid air.
Venus, the next in distance from the sun, is almost the exact twin of the earth in size, and many arguments may be urged in favor of its habitability, although it is suspected of possessing the same peculiarity as Mercury, in always keeping the same side sunward.
He was, therefore, under extremely favorable conditions for solving that great question of the habitability of the moon; but the solution still escaped him; he could distinguish nothing but desert beds, immense plains, and toward the north, arid mountains.
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