<unk> <unk> <unk> <unk> <unk>  Passage: The orbiter entered Venus orbit on October 23, 1975. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️  Question: What was it's mission?
Serve as a communications relay for the lander and to explore cloud layers and atmospheric parameters with several instruments and experiments