The Nature of Light: Light Speed and Intensity

The video tutorial explains how light intensity decreases with distance, using a spray paint analogy. It discusses the speed of light, which varies in different mediums, and introduces the concept of a lightyear, a unit of distance used in astronomy. The tutorial highlights that light from stars can be hundreds or thousands of years old due to the vast distances in space.

Explain the relationship between light intensity and distance using the spray paint example.

Why is the light we see from stars often very old?