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Dr Steve clarifies his question. When looking at objects in space like a planet billions of miles away. It takes light to see that planet. So when looking at that object say 12am on a given day, then what time did I actually see that object due to the delay in light reaching my eye?

When we see an asteroid coming at us, not only is there distance in light years that must be calculated for sight, there is also movement involved and speed too must be calculated. So by the time the object is actually seen by us on Earth, time and distance has changed. How is all this measured and what are we really seeing?

When we see objects in space it is not actually what is happening present due to the speed of light reaching our eye when looking at an object. There is always a delay. We are not seeing what we think we are actually seeing.

Dr. Steve

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8y ago

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