NASA astronaut and Expedition 73 Flight Engineer Mike Fincke smiles for a portrait during research operations for the Droplets fluid physics investigation. Fincke was inside the International Space Station’s Destiny laboratory module exploring how particles behave inside fluids. The microgravity study may inform commercial in-space manufacturing techniques and improve optical materials and pollution removal operations. Image: NASA

NASA astronaut and Expedition 73 Flight Engineer Mike Fincke smiles for a portrait during research operations for the Droplets fluid physics investigation. Fincke was inside the…

NASA astronaut Mike Fincke is departing the agency on Wednesday after 30 years of service. Throughout his career, he flew four missions, spent 549 days in