The Pioneer Venus Multiprobe released a total of four probes, which entered the atmosphere on 9 December 1978, returning data on its composition, winds and heat fluxes.
Pioneer Venus Orbiter je 4. decembra 1978 vstopil v eliptično tirnico okrog Venere in tam ostal več kot 13 let, pri tem pa preučeval atmosfero in z radarjem kartografiral površje.