- Sierra Space to open world's first commercial human spaceflight center and astronaut training academy to train the future astronaut corps for the new commercial space economy, with company offices at Kennedy Space Center. Sierra Space aims to begin professional astronaut selection process in 2023 https://www.sierraspace.com/newsroom/press-releases/sierra-space-to-open-human-spaceflight-center-train-the-future-astronaut-corps-for-the-new-commercial-space-economy/ 29 comments space