On 9/11/2024 1:02 AM, Quentin Anciaux wrote:
Le mer. 11 sept. 2024, 09:56, Alan Grayson <[email protected]> a
écrit :
On Wednesday, September 11, 2024 at 1:44:39 AM UTC-6 Quentin
Anciaux wrote:
Le mer. 11 sept. 2024, 09:42, Alan Grayson
<[email protected]> a écrit :
On Tuesday, September 10, 2024 at 3:50:08 PM UTC-6 Quentin
Anciaux wrote:
Le mar. 10 sept. 2024, 23:19, Alan Grayson
<[email protected]> a écrit :
On Tuesday, September 10, 2024 at 2:19:42 PM UTC-6
John Clark wrote:
On Tue, Sep 10, 2024 at 3:57 PM Alan Grayson
<[email protected]> wrote:
*>> Even if you ignore Dark Energy and
postulate that the Hubble constant
really is constant, every object a
megaparsec away (3.26 million
light-years) is moving away from us at
about 70 kilometers per second. So if
you try to look at objects a
sufficiently large number of
megaparsec away you will fail to find
any because they are moving away from
us faster than the speed of light.*
>/That was in the past. At present, the
universe is expanding at about 70 km/sec./
*Galaxies are receding from the Earth at 70
km/sec for EACH megaparsecdistant from Earth
they are. The further from Earth they are, the
faster they are moving away from us, so if
they are far enough away they will be moving
faster than the speed of light away from us. *
*
*
/> You're assuming the universe today is
infinite,/
*NO! I said IF the entire universe is infinite
today then it was always infinite, and IF it
was finite 10^-35 seconds after the Big Bang
then it's still finite today. I also said
nobody knows if the entire universe is
infinite or finite. *
*>*///Hubble's law applies to the past,
not to the future,/
*What the hell?!*
*How about an intelligent reply? Obviously, if the
universe is infinite today, it was always
infinite. But that's what I am questioning. For
galaxies to fall out of view, they have to moving
at greater than c. Now they aren't receding that
fast. How will they start moving that fast? You're
applying Hubble's law without thinking what it
says. Just because a galaxy is now receding at
less than c, how will continued expansion increase
that speed to greater than c? AG *
The farther they are the faster they are receding from
you, so as they continue to get farther away they
receed faster from you till the point they receed
faster than c and go out of your horizon.
Quentin
*That's your claim, but, like I wrote, if say, the rate of
expansion is fixed, the separation distance isn't
increasing faster than c. It's just increasing. AG *
Just take the balloon example, it's a perfect explanation,
any two points receed faster from each other as the balloon
inflates.
*If the rate of expansion is fixed, the distance along some
equator containing two separated galaxies increases linearly as a
function of the radial distance, s. *
No, the distance between two galaxies carried by the Hubble expansion
increases exponentially.
The problem, AG, is that you put no effort at all into understanding or
researching your on your own.
Brent
*So I don't see what you claim your model proves. AG *
You're correct that, with a fixed rate of expansion, the distance
between two galaxies increases linearly as a function of time.
However, the key point is that recession velocity depends on the
distance between the galaxies.
Using the balloon analogy: imagine two points on an inflating balloon.
Even if the balloon expands at a constant rate, the farther apart the
points are, the faster they move away from each other. This means the
rate at which the distance between the two points increases is
proportional to how far apart they are. So, as the distance between
galaxies grows, their recession velocity increases.
In an expanding universe, the same thing happens: even if the
expansion rate is constant, galaxies that are farther apart recede
faster. At large enough distances (like beyond the Hubble radius), the
recession velocity will exceed the speed of light because the space
between the galaxies is expanding faster.
So, while the distance may increase linearly with time, the recession
velocity still increases with distance, and at sufficiently large
distances, it exceeds . This is how galaxies beyond a certain distance
can recede faster than the speed of light, even with a constant rate
of expansion.
*John* K Clark See what's on my new list at
Extropolis
<https://groups.google.com/g/extropolis>
hwt
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