Definition: A reentry is a type of spaceflight where an astronaut or spacecraft returns to Earth from orbit, usually after a period of time in space. The exact duration and frequency of reentries can vary widely depending on the mission, but they are typically around 3-5 years long. Reenters are significant because they provide valuable information about the trajectory of the spacecraft and its environment at the time of entry into Earth's atmosphere. They can also help scientists to understand the effects of space debris and