Religions > Atheism > OT: Any cases of gravitational lensing showing two eras of same galaxy?
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Religions > Atheism |
| User: |
"Uncle Clover" |
| Date: |
11 Jan 2007 03:35:58 PM |
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OT: Any cases of gravitational lensing showing two eras of same galaxy? |
I find the phenomenon of gravitational lensing to be intriguing. But I haven't
found anything to indicate that it has or is thought to be capable of producing
the effect whereby the same galaxy appears twice, but is seen at different times
(like seeing the Milky Was in one place at its present age, and in another as it
was maybe a hundred million years ago). Has anything like that ever been
observed or is it even possible?
--
L8r,
Uncle Clover
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Reality is the soul's refusal to accept oblivion.
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Men are like peanuts - small and salty and great with beer.
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| User: "Denis Loubet" |
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| Title: Re: Any cases of gravitational lensing showing two eras of same galaxy? |
11 Jan 2007 04:16:08 PM |
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"Uncle Clover" <UncleClover@SpamMeNot.com> wrote in message
news:eabdq2lu0ur9j8ksj7lnt3u2p4m58qmvhl@4ax.com...
I find the phenomenon of gravitational lensing to be intriguing. But I
haven't
found anything to indicate that it has or is thought to be capable of
producing
the effect whereby the same galaxy appears twice, but is seen at different
times
(like seeing the Milky Was in one place at its present age, and in another
as it
was maybe a hundred million years ago). Has anything like that ever been
observed or is it even possible?
Well, if one path of light from subject to observer can be bent more than
another, one path would be longer than another, and that would mean you're
seeing different points in time. I suppose this could happen if the subject
galaxy is slightly out of line with the lensing mass. You would see one
image slightly further from the mass than the other, and the image that's
closer to the mass would be the one who's path is bent the most and thus
would be slightly older.
That's my best guess from my understanding of gravity and light. ;-)
--
Denis Loubet
dloubet@io.com
http//www.io.com/~dloubet
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| User: "Douglas Berry" |
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| Title: Re: OT: Any cases of gravitational lensing showing two eras of same galaxy? |
11 Jan 2007 09:36:26 PM |
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On Thu, 11 Jan 2007 16:35:58 -0500 there was an Ancient Uncle Clover
<UncleClover@SpamMeNot.com> who stoppeth one in alt.atheism
I find the phenomenon of gravitational lensing to be intriguing. But I haven't
found anything to indicate that it has or is thought to be capable of producing
the effect whereby the same galaxy appears twice, but is seen at different times
(like seeing the Milky Was in one place at its present age, and in another as it
was maybe a hundred million years ago). Has anything like that ever been
observed or is it even possible?
Now, because the lensing effect simply affects the photons already
enroute.
--
Douglas Berry Do the OBVIOUS thing to send e-mail
Atheist #2147, Atheist Vet #5
Jason Gastrich is praying for me on 8 January 2011
"The most beautiful thing we can experience is the mysterious. It is the
source of all true art and all science. He to whom this emotion is a
stranger, who can no longer pause to wonder and stand rapt in awe, is as
good as dead: his eyes are closed." - Albert Einstein
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| User: "Frank Mayhar" |
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| Title: Re: OT: Any cases of gravitational lensing showing two eras of samegalaxy? |
11 Jan 2007 11:22:40 PM |
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On Fri, 12 Jan 2007 03:36:26 +0000, Douglas Berry wrote:
On Thu, 11 Jan 2007 16:35:58 -0500 there was an Ancient Uncle Clover
<UncleClover@SpamMeNot.com> who stoppeth one in alt.atheism
I find the phenomenon of gravitational lensing to be intriguing. But I haven't
found anything to indicate that it has or is thought to be capable of producing
the effect whereby the same galaxy appears twice, but is seen at different times
(like seeing the Milky Was in one place at its present age, and in another as it
was maybe a hundred million years ago). Has anything like that ever been
observed or is it even possible?
Now, because the lensing effect simply affects the photons already
enroute.
Actually yes, because if a background object is lensed multiple times,
each path is of different length. The net effect is to see it at two
different places in space and at two different times in its history.
There are more than a few of these, in fact.
--
Frank Mayhar frank@exit.com http://www.exit.com/
Exit Consulting http://www.gpsclock.com/
http://www.exit.com/blog/frank/
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| User: "Matt Silberstein" |
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| Title: Re: OT: Any cases of gravitational lensing showing two eras of same galaxy? |
12 Jan 2007 10:51:02 AM |
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On Thu, 11 Jan 2007 21:22:40 -0800, in alt.atheism , Frank Mayhar
<frank@exit.com> in <0iij74-cm01.ln1@tinker.exit.com> wrote:
On Fri, 12 Jan 2007 03:36:26 +0000, Douglas Berry wrote:
On Thu, 11 Jan 2007 16:35:58 -0500 there was an Ancient Uncle Clover
<UncleClover@SpamMeNot.com> who stoppeth one in alt.atheism
I find the phenomenon of gravitational lensing to be intriguing. But I haven't
found anything to indicate that it has or is thought to be capable of producing
the effect whereby the same galaxy appears twice, but is seen at different times
(like seeing the Milky Was in one place at its present age, and in another as it
was maybe a hundred million years ago). Has anything like that ever been
observed or is it even possible?
Now, because the lensing effect simply affects the photons already
enroute.
Actually yes, because if a background object is lensed multiple times,
each path is of different length. The net effect is to see it at two
different places in space and at two different times in its history.
There are more than a few of these, in fact.
But the difference in age is pretty small.
--
Matt Silberstein
Do something today about the Darfur Genocide
http://www.beawitness.org
http://www.darfurgenocide.org
http://www.savedarfur.org
"Darfur: A Genocide We can Stop"
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| User: "Frank Mayhar" |
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| Title: Re: OT: Any cases of gravitational lensing showing two eras of samegalaxy? |
12 Jan 2007 12:57:30 PM |
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On Fri, 12 Jan 2007 16:51:02 +0000, Matt Silberstein wrote:
On Thu, 11 Jan 2007 21:22:40 -0800, in alt.atheism , Frank Mayhar
<frank@exit.com> in <0iij74-cm01.ln1@tinker.exit.com> wrote:
On Fri, 12 Jan 2007 03:36:26 +0000, Douglas Berry wrote:
On Thu, 11 Jan 2007 16:35:58 -0500 there was an Ancient Uncle Clover
<UncleClover@SpamMeNot.com> who stoppeth one in alt.atheism
I find the phenomenon of gravitational lensing to be intriguing. But I haven't
found anything to indicate that it has or is thought to be capable of producing
the effect whereby the same galaxy appears twice, but is seen at different times
(like seeing the Milky Was in one place at its present age, and in another as it
was maybe a hundred million years ago). Has anything like that ever been
observed or is it even possible?
Now, because the lensing effect simply affects the photons already
enroute.
Actually yes, because if a background object is lensed multiple times,
each path is of different length. The net effect is to see it at two
different places in space and at two different times in its history.
There are more than a few of these, in fact.
But the difference in age is pretty small.
I don't know the numbers offhand, but as a proportion of the distance to
the lensed object, yeah, it's pretty small. I would guess, though, that
it's still on the order of hundreds of thousands to a few millions of
light-years difference, though.
--
Frank Mayhar frank@exit.com http://www.exit.com/
Exit Consulting http://www.gpsclock.com/
http://www.exit.com/blog/frank/
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| User: "Matt Silberstein" |
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| Title: Re: OT: Any cases of gravitational lensing showing two eras of same galaxy? |
12 Jan 2007 04:28:46 PM |
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On Fri, 12 Jan 2007 10:57:30 -0800, in alt.atheism , Frank Mayhar
<frank@exit.com> in <q92l74-lfi1.ln1@tinker.exit.com> wrote:
On Fri, 12 Jan 2007 16:51:02 +0000, Matt Silberstein wrote:
On Thu, 11 Jan 2007 21:22:40 -0800, in alt.atheism , Frank Mayhar
<frank@exit.com> in <0iij74-cm01.ln1@tinker.exit.com> wrote:
On Fri, 12 Jan 2007 03:36:26 +0000, Douglas Berry wrote:
On Thu, 11 Jan 2007 16:35:58 -0500 there was an Ancient Uncle Clover
<UncleClover@SpamMeNot.com> who stoppeth one in alt.atheism
I find the phenomenon of gravitational lensing to be intriguing. But I haven't
found anything to indicate that it has or is thought to be capable of producing
the effect whereby the same galaxy appears twice, but is seen at different times
(like seeing the Milky Was in one place at its present age, and in another as it
was maybe a hundred million years ago). Has anything like that ever been
observed or is it even possible?
Now, because the lensing effect simply affects the photons already
enroute.
Actually yes, because if a background object is lensed multiple times,
each path is of different length. The net effect is to see it at two
different places in space and at two different times in its history.
There are more than a few of these, in fact.
But the difference in age is pretty small.
I don't know the numbers offhand, but as a proportion of the distance to
the lensed object, yeah, it's pretty small. I would guess, though, that
it's still on the order of hundreds of thousands to a few millions of
light-years difference, though.
I was thinking in terms of stellar lifespans. That is, we don't get
much of a chance to see something at a relatively young and old age. I
mean, what is a few million years between friends.
--
Matt Silberstein
Do something today about the Darfur Genocide
http://www.beawitness.org
http://www.darfurgenocide.org
http://www.savedarfur.org
"Darfur: A Genocide We can Stop"
.
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