Piri was a dead planet whose inhabitants created machines to run the necessities of life, so that they could enjoy the pleasures, before building a Guardian to control the machines. Their lives were perfect, and the Guardian was directed to maintain them, so the Guardian stopped time for them.
DUring the Alphan's visit to Piri, Koenig fires his laser, incapacitating the Servant, and revealing to the Alphans that she is nothing more than an android. This causes the Guardian to explode, freeing the minds of the Alphans and releasing the Moon from its grip. The Alphans race to the Eagles as the Moon returns to its previous course away from Piri. One by one, the Eagles lift off as the Alphans board and escape the explosions around them, then race to catch up with the Moon before it gets out of range.
Safely back on Alpha, the long range sensors reveal that there is now water, vegetation, everything that they need to sustain life on Piri. [1]