* Astronomy

Blobrana · L

RE: GRB050904 is there a problem

RoC · New

That's fine until you realize that the Hubble constant which defines the rate of expansion of the universe is currently 60 km/s Mpc1 (for objects 3 million light years apart) I realize that for objects separated by 12 billion light years this constant will be higher but it is still nowhere near the 240,000 km/s needed to fulfil the criteria. I have to be missing something but as yet I do not see what

Blobrana · L

Hum,
The expansion rate is indeed 80% of the speed of light, relative to our position 13.7 billion light years away.

RoC · New

Regardless of whether you look upon it as as space expanding or objects moving through space it still appears that that the distance between the two objects would necesitate the expansion rate to be 80% of the spped of light - I must be missing something but what ?

Blobrana · L

Hum,
there is no problem,
it is space that is expanding; objects like the milky way are not moving through space (simplified).

RoC · New

Here's the hypothesis
1. The age of the universe is 14 billion years
2. The 'oldest' object observed so far is 12 billion years old
3. The big bang happened

The implosion observed actually happened 2 billion years after the big bang. Assume that at that point the objects were 4 billion light years apart - each travelling in opposite directions at the speed of light so the calculation will be based on the maximum possible distance between the two objects.
We now have
Distance apart at time the implosion occurred = 4bln light years
Distance apart at time of observation = 12bln light years
Distance travelled by Earth since implosion = 10bln years * Speed

(Curr dist apart) = (Init dist apart) + (Time since implosion) * (Earth's speed)
(12 * 10 **9 * c) = (4 * 10 **9 * c) + (10 * 10 **9 * X)

hence X=4c/5

This is making some assumptions but will give the average speed of the Earth over this period.
The problem is that the calculated speed of the Earth through the universe
relative to it's initial position at the time of the big bang is nothing close to this
speed - SO WHAT GIVES ?? There has to be a flaw somewhere but where ?