CIR (IMAGE) NASA/Johnson Space Center Caption NASA astronaut and Expedition 59 Flight Engineer Christina Koch works inside the US Destiny laboratory module's Combustion Integrated Rack. She was replacing hardware for a series of experiments collectively known as Advanced Combustion via Microgravity Experiments (ACME). Credit NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.