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Is time as we know it already affected by the sun, earth, moon and other planetary bodies? would this affect what we can learn about the speed of light? (i.e. are we subject to time dilation and record things slightly lower than a baseline?)
And finally, Dr Cox predicted the possibility of travelling to the past, using a black hole to 'turn' our future around so that our past becomes our future.. what limitations are there in the way of this being theoretically possible?
do we see comets 'slowing down' as they approach the sun?
surely we could watch a star collapsing into one, in slow motion as such. Has this been observed?
…..time stops at the 'event horizon'
Quotesurely we could watch a star collapsing into one, in slow motion as such. Has this been observed?A stellar-mass black hole is typically less than 100km across. You do not want to be within 10 light years of a supernova explosion, or your goose will be very thoroughly cooked.
Quote …..time stops at the 'event horizon'
Quote …..time stops at the 'event horizon' If what Dr Cox says is taken at face value, it must be that the entire accretion history of a black hole since the formation of its event horizon should be visible to any observer whose technology allows him or her to manoeuvre into the right position. Of course, an observer will see these things by virtue of the light reflecting from them, but because the objects will not have crossed the event horizon, in the observer’s frame of reference, this should not be a problem. Strange as this might seem, it is even stranger to realise that, outside the frame of reference of the observer, all this material is not there, because it has long since plunged down the ever steepening gravity well into the depths of the black hole; so how can light reflect off it?...If we consider the situation from the point of view of the outside observer as an example of asymptotic decay, in which the infalling object is not simply stuck for ever in the same state, but is gradually vanishing, with its progress being recorded by an asymptotic curve, then, in theory, it would never actually vanish, but in reality, like Zeno’s arrow, it would come to a conclusion. In other words, it would vanish. This seems to be the simplest explanation, and the simplest may well be the best.