Zitat des Tages von Konstantin Tsiolkovsky:
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.The Earth is the cradle of humanity, but mankind cannot stay in the cradle forever.
Konstantin TsiolkovskyEarth is the cradle of humanity, but one cannot remain in the cradle forever.
Konstantin Tsiolkovsky