4 ms·

Net effect is not zero if the photon bounces off of the sail

• comboy 7y ago
  Why use sail then? You can just shoot your photon the opposite way.
  • seiferteric 7y ago
    That would be a "photon rocket" which is an existing idea, but requires a lot of energy, whereas this uses free energy from the sun.
• gitgud 7y ago
  If it bounces off in the opposite direction then the net effect would be actually be negative.
  • deleted 7y ago
    [deleted]