A Future Past Trip
Imagine our intrepid Time Traveller, George, leaving the Earth and travelling through Hyperspace, perhaps with the aid of a wormhole, to a position 10 light years away from the planet. Being Hyperspace travel it has taken practically no time at all when compared to Cosmic Time. George has simply moved to a different set of spacial coordinates in his Hypership.
He now looks back at Earth and the light he sees has taken 10 years to reach his present position and therefore left Earth in 1987. Sure enough as he uses his ultra high-powered portable Hubble Telescope he focusses in on his house and sees himself leaving to go to the office, just as he remembered doing 10 years earlier. What he sees is not actually himself but merely an image.
Moving to the other side of the Hypership George focusses his telescope on a planet also 10 light years away but in the opposite direction. As he looks he witnesses the collision of an asteroid colliding with the planet. The light from this event has also taken 10 years to travel the distance from the planet to his Hypership so the event on the Cosmic World Line also occurred in 1987.
George now returns in his Hypership via Hyperspace to Earth and has been away for only a matter of minutes as all the travelling has been through Hyperspace. He uses his telescope and focusses on the same planet but can see no sign of the asteroid. This is not because he has missed seeing it collide with the planet but because as seen from Earth it hasn't collided yet. Because the planet is 20 light years from the Earth (10 light years Earth to Hypership + 10 light years Hypership to Planet) the light from the collision event will take a further 10 years to arrive at Earth. It will not be seen until 2007 despite the fact it happened in 1987.
By moving his location in space George has seen an event that happened on Earth 10 years earlier and seen an event that will be seen in 10 years time. He hasn't actually travelled in time as both these events have happened and his World Line is still in sync with the Cosmic World Line. Talking to someone on Earth about his trip and describing the collision of the asteroid will give the illusion that he has travelled to the future particularly when the event is seen from Earth in 2007. But of course no time travelling to the future has occurred.
This example shows that History is relative. The position in the Universe will effect the description of events and the relativity of each event to another. Even if time travel is not possible but the Earth is visited by cosmic travellers from the other side of the galaxy using a Hyperspace route with no time differential relative to Earth their history of our galaxy will be completely different from our own.
Two astronomical events recorded by these cosmic travellers may be separated by a longer timescale than the same events recorded on Earth and may even be in a different order.
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Anthony Edwards - December 1996