Sitting at home, orbiting a star, falling into a blackhole, or being a photon, an electron, or a GPS sat. All are moving through spacetime, of course on differe

Sitting at home, orbiting a star, falling into a blackhole, or being a photon, an electron, or a GPS sat. All are moving through spacetime, of course on different trajectories. Especially when looking at them with the lens of General Relativity.