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That depends on when a failure were to occur. If we have a failure while the spacecraft is en route to its destination, perhaps we can recover because we may have enough time.

If we have a failure during rendezvous with our target, it could be a very bad day.

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...necropost, but:

You always need to be able to recover from a soft reboot, even during maneuvers; you're in a high radiation environment and any passing high energy particle or cosmic ray can trigger this.

Dynamic memory allocation is extremely frowned-upon in embedded/real-time systems such as flight systems for exactly that reason. You simply cannot handle out-of-memory and fragmentation issues in a safe manner.

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