Observing Past Events in the Future?

I was reading a Brief History of Time and Hawking was discussing how when we look at distant stars, the light from them is millions of years old because it travels at 3* 10^8m/s in a vaccum; then he linked it with Kennedy's assasination and observing the light rays from some distant galaxy. I understand this but my question is:





Wouldn't the light rays from a particular event that occured on Earth such as someone eating an ice cream, writing a test or even walking down the street - be reflected, absorbed, diffracted/interefered with or distorted in some way so even if some distant galaxy with the technology to collect information from light rays - piecing together the events on Earth would be impossible??

Observing Past Events in the Future?
They might have photoshop version 100
Reply:You are correct. it would not be possible.
Reply:A distant galaxy would receive only few photons from our earth. If we take a photo of a distant star, we need an exposure time of many hours or days.





And the resolution is a problem. Telescope resolving power depends on lens diameter. To see a car on moon you need a telescope with a 50m diameter lens.
Reply:To be able to determine such small values of light that you are describing would be impossible as the light from our sun would intefere to much as would other more powerful sources of light so the further away you get the less "accurate" the picture becomes