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…

- Konstantin Tsiolkovsky

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…

- Konstantin Tsiolkovsky

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

- Konstantin Tsiolkovsky

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…

- Konstantin Tsiolkovsky

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 …

- Konstantin Tsiolkovsky

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

- Konstantin Tsiolkovsky

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

- Konstantin Tsiolkovsky

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…

- Konstantin Tsiolkovsky

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

- Konstantin Tsiolkovsky