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A word spoken is a terrible thing when it suddenly utters what the heart has long allowed.

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Konstantin Tsiolkovsky

All our knowledge - past, present, and future - is nothing compared to what we will never know.

Compared, History, Know, Knows, Nothing, Past
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The Earth is the cradle of Humanity. But one doesn't always live in the cradle.

Cradle, Earth, Humanity, Live, Science

First, inevitably, the idea, the fantasy, the fairy tale. Then, scientific calculation. Ultimately, fulfillment crowns the dream.

Calculation, Crowns, Dream, Ideas, Scientific, Space

Men are weak now, and yet they transform the Earth's surface. In millions of years their might will increase to the extent that they will change the surface of the Earth, its oceans, the atmosphere, and themselves. They will control the climate and the Solar System just as they control the Earth. They will travel beyond the limits of our planetary system; they will reach other Suns, and use their fresh energy instead of the energy of their dying luminary.

Change, Men, Ocean, Solar, System, Years

Man will not always stay on Earth; the pursuit of light and space will lead him to penetrate the bounds of the atmosphere, timidly at first, but in the end to conquer the whole of solar space.

Atmosphere, Bounds, Light, Men, Penetrate, Space

Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System. All kinds of danger wait for him on the Earth. . . . We have said a great deal about the advantages of migration into space, but not all can be said or even imagined.

Danger, Earth, Men, Moon, Said, Space
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