Fragmenting is rocket science based on occult recreation which is a terrible view of time and space because it is harmful.

A rocket passing earth has center mechanism sending a short pulse of light in both directions. The observer in the rocket would see the pulse arriving simultaneously at each bulkhead. When observed on earth, the two pulses have same speed relative to earth not arriving simultaneously. The rear would advance rapidly to the bulkhead while the forward bulkhead is retreating from its pulse.

One state of motion is saying no universal absolute agreement on same moment in two separate locations. Reason being is it is unknown information utilizing recreation techniques that the universe doesn’t agree with. Lol