Final answer:
The motion of a laser dot over six years would likely exhibit an interference pattern consistent with wave interference and diffraction principles if it were part of an experimental setup to produce such a pattern or in holographic imaging.
Step-by-step explanation:
The question relates to the patterns one might expect from the motion of a laser dot over six years. Considering that a laser beam emitted by an observatory travels in a straight line and that a laser passing through a grid produces an interference pattern, the motion of the laser dot over six years would likely exhibit similar characteristics. When a screen is exposed to very weak light, the interference pattern emerges gradually with individual photon hits appearing as dots, where the dot density is higher at points where the interference pattern is most intense. This is also applicable to an interference pattern on holographic film. If the laser dot is part of an experimental setup to produce an interference pattern or is part of holographic imaging, the pattern would be consistent with the principles of wave interference and diffraction.