<Li> Pioneer Venus Multiprobe (Pioneer Venus 2, Pioneer 13)--launched August 1978 <Ul> <Li> Pioneer Venus Probe Bus--transport vehicle and upper atmosphere probe </Li> <Li> Pioneer Venus Large Probe--300 kg parachuted probe </Li> <Li> Pioneer Venus North Probe--75 kg impactor probe </Li> <Li> Pioneer Venus Night Probe--75 kg impactor probe </Li> <Li> Pioneer Venus Day Probe--75 kg impactor probe </Li> </Ul> </Li> <Ul> <Li> Pioneer Venus Probe Bus--transport vehicle and upper atmosphere probe </Li> <Li> Pioneer Venus Large Probe--300 kg parachuted probe </Li> <Li> Pioneer Venus North Probe--75 kg impactor probe </Li> <Li> Pioneer Venus Night Probe--75 kg impactor probe </Li> <Li> Pioneer Venus Day Probe--75 kg impactor probe </Li> </Ul> <Li> Pioneer Venus Probe Bus--transport vehicle and upper atmosphere probe </Li> <Li> Pioneer Venus Large Probe--300 kg parachuted probe </Li>

When was the first pioneer space probe launched