A Quote by Pierre-Simon Laplace

However, the small probability of a similar encounter [of the earth with a comet], can become very great in adding up over a huge sequence of centuries. It is easy to picture to oneself the effects of this impact upon the Earth. The axis and the motion of rotation changed; the seas abandoning their old position to throw themselves toward the new equator; a large part of men and animals drowned in this universal deluge, or destroyed by the violent tremor imparted to the terrestrial globe.
The long summer was over. For ages a tropical climate had prevailed over a great part of the earth, and animals whose home is now beneath the Equator roamed over the world from the far South to the very borders of the Arctics ... But their reign was over. A sudden intense winter, that was also to last for ages, fell upon our globe.
The sea erupted. Often the sea and land changed places. The immobility of contours of continents and seas, a dogma in geology, has no basis in fact. And immediately there is the problem of the climate. There were ancient climates that were very different from what they are today. If those corals grew where they were found, certainly the Earth was not travelling with the same elements of rotation and revolution which means not in the same orbit, not with the axis directed in the same position as it is today. If you don't believe it, try to conservate corals on the North Pole.
Hold your hands out over the earth as over a flame. To all who love her, who open to her the doors of their veins, she gives of her strength, sustaining them with her own measureless tremor of dark life. Touch the earth, love the earth, honor the earth, her plains, her valleys, her hills, and her seas; rest your spirit in her solitary places. For the gifts of life are the earth's and they are given to all, and they are the songs of birds at daybreak, Orion and the Bear, and dawn seen over ocean from the beach.
But although the attractive virtue of the earth extends upwards, as has been said, so very far, yet if any stone should be at a distance great enough to become sensible compared with the earth's diameter, it is true that on the motion of the earth such a stone would not follow altogether; its own force of resistance would be combined with the attractive force of the earth, and thus it would extricate itself in some degree from the motion of the earth.
The basic idea of Western science is that you don't have to take into account the falling of a leaf on some planet in another galaxy when you're trying to account for the motion of a billiard ball on a pool table on earth. Very small influences can be neglected. There's a convergence in the way things work, and arbitrarily small influences don't blow up to have arbitrarily large effects.
The true scientist no longer attempts to disprove the pull of gravity, or the rotation of the earth, or the motion of heavenly bodies, or the sequence of the seasons, or man's need of food and water, or the function of the heart.
If... the motion of the earth were circular, it would be violent and contrary to nature, and could not be eternal, since ... nothing violent is eternal .... It follows, therefore, that the earth is not moved with a circular motion.
However dangerous might be the shock of a comet, it might be so slight, that it would only do damage at the part of the Earth where it actually struck; perhaps even we might cry quits if while one kingdom were devastated, the rest of the Earth were to enjoy the rarities which a body which came from so far might bring it. Perhaps we should be very surprised to find that the debris of these masses that we despised were formed of gold and diamonds; but who would be the most astonished, we, or the comet-dwellers, who would be cast on our Earth? What strange being each would find the other!
Never in all their history have men been able truly to conceive of the world as one: a single sphere, a globe, having the qualities of a globe, a round earth in which all the directions eventually meet, in which there is no center because every point, or none, is center - an equal earth which all men occupy as equals. The airman's earth, if free men make it, will be truly round: a globe in practice, not in theory.
In the Great Deluge in the days of Noah, nearly all mankind perished, eight persons alone being saved in the Ark. In our days a deluge, not of water but of sins, continually inundates the earth, and out of this deluge very few escape. Scarcely anyone is saved.
To indicate how large a part of the Earth is covered by the oceans, we might call attention to the fact that a whole hemisphere, with its center near New Zealand, would have only one-tenth of its area as dry land! And the average depth of the seas is over two miles.
It is not easy to see how the more extreme forms of nationalism can long survive when men have seen the Earth in its true perspective as a single small globe against the stars.
If we look more closely, we see that any violent display of power, whether political or religious, produces an outburst of folly in a large part of mankind; indeed, this seems actually to be a psychological and sociological law: the power of some needs the folly of others. It is not that certain human capacities, intellectual capacities for instance, become stunted of destroyed, but rather that the upsurge of power makes such an overwhelming impression that men are deprived of their independent judgment, and...give up trying to assess the new state of affairs for themselves.
It is not given to us to know which acts or by whom, will cause the critical mass to tip toward an enduring good. What's needed for dramatic change is an accumulation of acts, adding, adding to, adding more, continuing. We know that it does not take 'everyone on Earth' to bring justice and peace, but only a small, determined group who will not give up during the first, second, or hundredth gale.
I also require much time to ponder over the matters themselves, and particularly the principles of mechanics (as the very words: force, time, space, motion indicate) can occupy one severely enough; likewise, in mathematics, the meaning of imaginary quantities, of the infinitesimally small and infinitely large and similar matters.
If Earth is considered a closed system, there will be less for all forever. The frontier is closed, the wilderness is gone, nature is being destroyed by human consumers, while billions are starving. The future indeed looks grim, and there are, ultimately, no really long-range, positive solutions, nor motivation for making the sacrifices and doing the hard work needed now, unless we understand that we are evolving from an Earth-only toward an Earth-space or universal species.
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