The Misconception:
The statement "time stops at the speed of light" is a bit misleading. It's more accurate to say that time dilation occurs as an object approaches the speed of light. Time dilation means time slows down relative to a stationary observer.
How Photons Move:
* No Rest Frame: Photons, being massless particles, always travel at the speed of light. They don't have a "rest frame" where they're stationary. This means there's no frame of reference where you could say time "stops" for them.
* Proper Time: In the context of special relativity, the concept of proper time is important. Proper time is the time measured by an observer in their own frame of reference. For a photon, its proper time is zero. This doesn't mean it "experiences" no time, but rather that its journey takes zero time from its own perspective.
* Relativistic Effects: From our perspective, photons do "experience" time in the sense that they take a finite amount of time to travel from one point to another. However, their experience of time is different from our own due to the effects of special relativity.
Think of it this way:
Imagine a photon traveling from the sun to Earth. From our perspective, it takes about 8 minutes. For the photon, however, the journey is instantaneous. This is because its proper time is zero.
Key Points:
* Time dilation is a consequence of special relativity, and it applies to objects traveling at speeds approaching the speed of light.
* Photons always travel at the speed of light and have no rest frame.
* The concept of "proper time" helps us understand how photons experience time differently from massive objects.
It's important to remember that our understanding of time and relativity is still evolving. These concepts are complex and challenging to grasp fully.
