см. тж. первый
In the course of this flight, orbital docking with an Agena target rocket was achieved for the first time .
Special attention has been paid to the liquid-propellant rockets and engines that were originally outlined by К. Е. Tsiolkovsky.
…the pilot-cosmonaut A. A. Leonov flying in the Voskhod-2 became the first man to step out into space…
… Luna-9 and Luna-13 were the first to soft-land on the Moon…