The idea of a camera that can look back in time, capturing events that have already occurred, is an intriguing concept. However, based on our current understanding of physics, it is highly unlikely that such a device could be developed.
The fundamental reason behind this limitation is the finite speed of light. According to the theory of relativity, information, including light, cannot travel faster than the speed of light in a vacuum. This means that light from a distant object takes time to reach our eyes or any other detecting device.
To capture an event that has already happened, light or other electromagnetic signals would need to travel from that event to the camera's location. If the camera is far away from the event, it would take a certain amount of time for the light to reach the camera. By the time the light reaches the camera, the event has already passed, and it would be impossible to "see" it in real time.
While it is theoretically possible to use powerful telescopes to observe distant objects and capture light that has traveled for millions or billions of years, this is not the same as looking back in time. We are simply observing the remnants of light that was emitted by those objects in the past.
In conclusion, the concept of a camera that can look back in time, capturing events that have already occurred, goes against our current understanding of physics and the finite speed of light.