Konstantin Tsiolkovsky

The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.

From the moment of using rocket devices, a great new era will begin in astronomy: the epoch of the more intensive study of the firmament.

Mankind will not forever remain on Earth but, in the pursuit of light and space, will first timidly emerge from the bounds of the atmosphere and then advance until he has conquered the whole of circumsolar space.

My entire life consisted of musings, calculations, practical works, and trials. Many questions remain unanswered; many works are incomplete or unpublished. The most important things still lie ahead.

I do not remember how it got into my head to make the first calculations related to rocket. It seems to me the first seeds were planted by famous fantaseour, J. Verne.

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

Earth is the cradle of humanity, but one cannot remain in the cradle forever.

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.

All the universe is full of the lives of perfect creatures.