Two NASA space probes to Venus. Pioneer Venus 1 (also known as Pioneer Venus orbiter) went into orbit around Venus, photographing the planet's clouds and mapping its surface by radar. Pioneer Venus 2 (also known as the multiprobe) ejected four sub-probes that analysed the planet's clouds and atmosphere during their descent. One of the sub-probes survived its impact with Venus, continuing to transmit from the surface for over an hour.
Pioneer Venus Probes
Pioneer Venus 1
1978 May 20
Entered orbit around Venus 1978 December 4
Pioneer Venus 2
1978 August 8
Ejected four smaller probes which entered the atmosphere of Venus 1978 December 9
Subjects: Astronomy and Astrophysics.