11. This inclined travel path follows from the transformation from the interferometer rest frame to the aether rest frame. 12. This inclined travel path follows from the transformation from the interferometer rest frame to the aether rest frame . 13. The spectrometer was centered on the 21 cm hydrogen line in the rest frame of each observed star. 14. The timelike component is zero in the particle's rest frame , but not in any other frame. 15. With respect to the rest frame of the apparatus, the beams travel the same distance at different speeds. 16. Are the components of spin the lab frame, calculated from those in the particle's rest frame . 17. The vierbein defines a local rest frame , allowing the constant Dirac matrices to act at each spacetime point. 18. :: E = mc ^ 2 doesn't apply to photons, because they have no rest frame . 19. Since the relationship is true in the rest frame of the second particle, it is true in any reference frame. 20. If a stationary box contains many particles, it weighs more in its rest frame , the faster the particles are moving.
