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 t….

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

Consider a cask filled with a highly compressed gas. If we open one of its taps the gas will escape through it in a continuous flow, the elasticity o….

For me, a rocket is only a means--only a method of reaching the depths of space--and not an end in itself... There's no doubt that it's very importan….

Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System..

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 ….

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

A planet is the cradle of mind, but one cannot live in a cradle forever..

To set foot on the soil of the asteroids, to lift by hand a rock from the Moon, to observe Mars from a distance of several tens of kilometers, to lan….

From the rocket we can see the huge sphere of the planet in one or another phase of the Moon. We can see how the sphere rotates, and how within a few….

The Earth is the cradle of Humanity. But one doesn't always live in the cradle..

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 ….