EvC Forum: Did the expansion rate of the universe exceed lightspeed?

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Topic: Did the expansion rate of the universe exceed lightspeed?

lyx2no

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Message 53 of 86 (459361)
03-06-2008 10:43 AM

Reply to: Message 16 by fallacycop
03-01-2008 6:05 PM

Re: Did the expansion rate of the universe exceed lightspeed?

The expansion rate of the universe is measured in Km/second/Megaparsecs (or some equivalent unit).

My favorite equivalent unit: 11m/year/AU. It allows one to see how minor the expansion is in local space.

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lyx2no

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Posts: 1277

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Message 56 of 86 (459420)
03-07-2008 2:25 AM

Reply to: Message 55 by Percy
03-06-2008 11:37 AM

Re: Did the expansion rate of the universe exceed lightspeed?

It is enough to drag the Earth out of its orbit by the diameter of a hydrogen atom.

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lyx2no

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Message 64 of 86 (460310)
03-14-2008 12:49 AM

Reply to: Message 62 by LucyTheApe
03-13-2008 11:50 PM

Re: acceleration

Hello LucyThe Ape:

If I pick up a stone and take it to the end of the universe, and drop it, and there's nothing except the earth, how fast is it going when it hits the ground?

If I may field an easy one:

In a static universe 11.2 km/s. But that also pretty much ” (10.9 km/s),neglecting atmosphere ” applies to a stone dropped from 300 km up.

Edit: I had originally calculated the greatest distance at which one could drop a stone from in our dynamic universe and still have it fall at all and botched the reasoning; hence, a wrong answer. I'll sleep on it.

Edited by lyx2no, : I screwed up an easy one.

Edited by lyx2no, : I was too sloppy in my "round about".

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lyx2no

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Posts: 1277

From: A vast, undifferentiated plane.

Joined: 02-28-2008

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Message 67 of 86 (460344)
03-14-2008 10:00 AM

Reply to: Message 66 by cavediver
03-14-2008 9:13 AM

Re: acceleration

Good morning cavediver:

In an expanding Universe, a stone sufficiently far away will never make it to the Earth as the expansion will work to increase the distance between the stone and the Earth.

Sufficiently far by this mornings calculations is 14 parsecs.

I also cleaned up my statement for a static drop as well. I’ve got to remember that no matter how insignificant an error, even if not relevant to an argument, will be pounced upon by those desperate to defend an untenable position.

Edit #2: Last night when doing the original calculations I used an erroneous conversion factor of 3.09”10²⁵ m/Mps and failed to notice that it was three orders of magnitude high when I picked it back up this morning.

The correct figure should be 0.43 parsecs, maybe.

Edited by lyx2no, : Typo

Edited by lyx2no, : To pull my head out.

Kindly

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lyx2no

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Posts: 1277

From: A vast, undifferentiated plane.

Joined: 02-28-2008

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Message 77 of 86 (460385)
03-14-2008 3:50 PM

Reply to: Message 72 by ICANT
03-14-2008 12:48 PM

Re: acceleration

Hello ICANT:

If expansion is true and expansion it taking place at light speed and is accelerating, they would never be able to collide.

The resultant expansion of space is only proceeding at the speed of light between two bodies if those two bodies are 13.7 billion ly apart.

The recession between M31 and the Milky Way due to the expansion of space is only:
3”10⁸ m/s(2.2”10⁶ ly/13.7”10 ⁹ ly)=4.8”10⁴ m/s.

A fifth of the portion of the speed at which the two are approaching and an insignificant portion of the speed of light.

Edited by lyx2no, : To comport with reality.

Kindly

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