Simultaneously, a devastating secret is revealed. Professor Brand’s elegant equation to save humanity was always impossible. Plan A—launching the massive space stations from Earth—was a lie. The true, coldly logical mission was Plan B: use the Endurance ’s 5,000 frozen human embryos to colonize a new world, leaving Earth’s current population to die. The professor, a utilitarian, believed humanity must survive as a genetic concept, not as living individuals. Cooper, a parent, cannot accept this.
Cooper finds himself behind the bookshelf in his daughter Murph’s childhood bedroom, able to see every moment of the past simultaneously. This is the explanation for the film’s opening “ghost”: Cooper was always the ghost, sending a gravitational anomaly (the “STAY” message) and, crucially, the quantum data from inside the black hole (which TARS observed) to the adult Murph. interstellar movie explanation
Dizkover