human
I've heard that the sands of time are running out. Is that true?
assistant
Yes, the sands of time are running out. Time is a fundamental concept in physics and mathematics. The universe is expanding at an ever increasing rate as it ages. As the universe expands, so does the amount of space between galaxies. This expansion causes light to travel farther away from its source over time. In other words, the speed of light is decreasing over time due to the expansion of the universe.