Considering that the energy of photons contributes to the mass of a black hole, and that the energy of photons hypothetically trapped in a box would contribute to the mass of the system, if a laser were powerful enough would you be able to put a grain of sand in orbit around the beam?
Picture it like this: https://i.imgur.com/yCHMrwC.png
Of course this would only work if the orbital plane is perpendicular to the beam, far away from the laser pointer, and only with an unrealistic power. But in physics questions we can assume that because spherical cows.
u/logperf — 3 days ago