National Space Science Data Center

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• Spaceflight Osteopenia: Spaceflight Osteopenia is a condition where astronauts experience a decrease in bone mineral density during spaceflight. This is caused by the lack of mechanical loading on the bones due to the microgravity environment. The lack of gravity ... Read More >>
• Flight Control Systems: Flight Control Systems are the set of technologies and procedures used to manage and regulate the movement of spacecraft and aircraft. These systems are responsible for ensuring the safety and efficiency of flight operations, and include a ... Read More >>
• Willy-Willy: Willy-Willy is a term used to describe a dust devil, a small, rapidly rotating wind that is made visible by the dust, dirt or debris it picks up. In space and astronautical engineering context, Willy-Willy can refer to the dust devils that ... Read More >>