MIT and the Breakthrough Initiatives are undertaking a Venus Life Finder Mission Concept Study. The study is inspired by the discovery of phosphine (PH₃) gas in the Venusian atmosphere. On Earth PH₃ is only produced by life and on Venus there is so far no explanation for PH₃’s presence involving known chemistry. The MIT-led study aims to determine practicability of low-cost exploratory Venus missions, including a small, medium, and large mission concept. The mission concept study will be accompanied by science research into the possibility of microbial life in the clouds of Venus and also into whether or not non-life processes could somehow produce PH₃ gas. 

https://breakthroughinitiatives.org/news/31