Objects appear smaller as distance increases due to the decreasing incidence of photons reaching the observer's eye. At a certain distance, an object may become invisible to the human eye because the number of photons is insufficient to form a discernible image. However, theoretically, if there are no obstructions and one waits long enough, the object remains detectable as photons will eventually reach the observer, assuming a non-expanding universe.
PREREQUISITESStudents of physics, optical scientists, and anyone interested in the principles of visibility and perception in relation to distance and light.