"jacob navia" <[email protected]> wrote in message
> George Dishman a écrit :
>> Releativity says an object cannot travel through
>> space faster than the speed of light in vacuo,
>> but that doesn't stop the sapce between objects
>> expanding at a rate such that the distance between
>> them increases faster than that speed.
> SPACE itself expands ?????
That is the common way of expressing it.
> Sorry but INTO WHAT would space "expand" ????
It is not embedded in some more fundamental
manifold, space isn't "in" anything.
> I would bet that it would expand into... more space isn't it?
> This is just nonsense.
It is indeed.
> But imagine for a moment that space is "expanding" faster than light, as
> proposed by this wonderful "inflation" theory.
> Since no object can go faster than light, NOTHING MOVES and all objects in
> the universe have negative speed:
Don't confuse SR and GR, the limit is local.
Consider a galaxy we can see perhaps 10 billion
light years away. Space between us and it is
expanding so the distance is increasing at a
significant proportion of the speed of light.
However, light within that galaxy is moving
past its stars at the speed of light relative
to those stars in all directions.
> point a point b
> object x -->
> Object "X" starts moving at some speed smaller than "c" to point b, say,
> at 50 Km/sec. In one second object x has traveled 50 Km, but the distance
> between a and b has increased by more than 300 000 Km since space is
> This reasoning is valid FOR ANY POINT A AND B.
The reasoning is valid only for objects sufficiently
far apart, the speed is proportional to the distance.
> Then, object X will NEVER reach point b, ...
Correct, it is called a "horizon".
> ... nothing in the universe can move at all,
No, object x is still moving relative to a.
> the temperature of the universe is below absolute zero.
> At absolute zero objects do not move at all. But since space is expanding,
> the speed of every object in this universe is negative (the object is
> flying AWAY from all other objects in the universe)
> All this is quite comic.
Indeed, your ideas are bizarre.
> Space is "expanding". Yeah.
> And I am getting younger every day.
Perhaps that's true, your infantile response
appears to confirm it.