I've been meaning to write sometihng about this for some time, but have never really got round to it!
I can see one major flaw with attempting time travel -
As everything in the universe is moving so fast, nothing is in the same place for any really measurable amount of time.
I.e. the Earth is not in the same relative place in the universe it was 1.2.3. Seconds ago, let alone days/weeks/months or even years!
I don't know what the actual figures are, but the Earth is probably at least 100,000s if not millions or billions of miles from where it was 1 year
So the problem is this - if you made a time machine and transported to 1 year in the past or 1 year in the future to the exact same place in space,
then you would materialise in emptiness (or maybe even another star or planet!), an immense distance away from Earth.
I think that making the portal to travel through time would be the very easy part, in comparison to making it also reappear in the equivilent
location in space.
You would have to bear in mind the spin of the Earth, it's orbit around the Sun, the Solar systems position within the Galaxy, the Galaxy's position
in the Universe, and that's simple and within our current boundaries of knowledge (or rather my primative knowledge!
It doesn't bear in mind any time/space disturbances caused by black holes, or other theoretical anomolies.
Just wondered what everyone else thinks really.
P.S. I don't think this is really good enough to start it's own thread, but have you ever thought about this:
It takes 1.2 seconds for light to reach the moon and 1.2 back - RTT 2.4 seconds.
So..... If you could get a big enough mirror on the moon and a big enough telescope on the Earth, if you walked over to the telescope and looked
through it, 2.4 seconds later you would see yourself walk over to the telescope and look through it....
Yeah, I know it's stupid (that's why it doesn't deserve a thread!) but I always think it's pretty neat. It confuses some people I know!
Sound more interesting then bouncing a laser off the moon into your eye or something....