Spacecraft which reentered in 1973

first crewed mission of the Skylab program

Soviet space station which was launched in 1973

second crewed mission of the Skylab program

crewed flight of the Soyuz programme

Soviet Salyut space station that malfunctioned shortly after launch

AEROS satellites were to study the aeronomy i. e. the science of the upper atmosphere and ionosphere, in particular the F region under the strong influence of solar extreme ultraviolet radiation. To this end the spectrum of this radiation was recorded aboard by one instrument (of type Hinteregger) on the one hand and a set of 4 other instruments measuring the most important neutral uand iononized parameters at the satellite's position on the other.