Theoretically if I was 66 million light years away from earth and had a telescope strong enough would I be able to see the dinosaurs if I faced it towards earth and nothing was obstructing my view?
In: Physics
Yes.
Imagine this:
* On Monday I take a Polaroid photograph of a house. I put that in an envelope and post it to you.
* On Tuesday the house is knocked down.
* On Wednesday you receive my envelope and you see the picture of the house
* Even though the image literally just reached you, you are seeing something from the past that no longer exists.
Thats what would happen with your telescope.
Because of the time it takes for the image to travel to you, you are seeing the past.
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