 |
|
| Science Forum Index » Astronomy Forum » Blast From The Past... |
|
Page 1 of 2 Goto page 1, 2 Next |
|
| Author |
Message |
| HVAC... |
 Posted: Fri Oct 30, 2009 12:44 am |
|
|
|
Guest
|
Astronomers using the National Science Foundation's Very Large Array
(VLA) radio telescope have gained tantalizing insights into the nature
of the most distant object ever observed in the Universe -- a gigantic
stellar explosion known as a Gamma Ray Burst (GRB).
The explosion was detected on April 23 by NASA's Swift satellite, and
scientists soon realized that it was more than 13 billion light-years
from Earth. It represents an event that occurred 630 million years
after the Big Bang, when the Universe was only four percent of its
current age of 13.7 billion years.
"This explosion provides an unprecedented look at an era when the
Universe was very young and also was undergoing drastic changes. The
primal cosmic darkness was being pierced by the light of the first
stars and the first galaxies were beginning to form. The star that
exploded in this event was a member of one of these earliest
generations of stars," said Dale Frail of the National Radio Astronomy
Observatory.
Astronomers turned telescopes from around the world to study the
blast, dubbed GRB 090423. The VLA first looked for the object the day
after the discovery, detected the first radio waves from the blast a
week later, then recorded changes in the object until it faded from
view more than two months later.
"It's important to study these explosions with many kinds of
telescopes. Our research team combined data from the VLA with data
from X-ray and infrared telescopes to piece together some of the
physical conditions of the blast," said Derek Fox of Pennsylvania
State University. "The result is a unique look into the very early
Universe that we couldn't have gotten any other way," he added.
The scientists concluded that the explosion was more energetic than
most GRBs, was a nearly-spherical blast, and that it expanded into a
tenuous and relatively uniform gaseous medium surrounding the star.
Astronomers suspect that the very first stars in the Universe were
very different -- brighter, hotter, and more massive -- from those
that formed later. They hope to find evidence for these giants by
observing objects as distant as GRB 090423 or more distant.
"The best way to distinguish these distant, early-generation stars is
by studying their explosive deaths, as supernovae or Gamma Ray
Bursts," said Poonam Chandra, of the Royal Military College of Canada,
and leader of the research team. While the data on GRB 090423 don't
indicate that it resulted from the death of such a monster star, new
astronomical tools are coming that may reveal them.
"The Atacama Large Millimeter/submillimeter Array (ALMA), will allow
us to pick out these very-distant GRBs more easily so we can target
them for intense followup observations. The Expanded Very Large Array,
with much greater sensitivity than the current VLA, will let us follow
these blasts much longer and learn much more about their energies and
environments. We'll be able to look back even further in time," Frail
said. Both ALMA and the EVLA are scheduled for completion in 2012.
Chandra, Frail and Fox worked with Shrinivas Kulkarni of Caltech, Edo
Berger of Harvard University, S. Bradley Cenko of the University of
California at Berkeley, Douglas C.-J. Bock of the Combined Array for
Research in Millimeter-wave Astronomy in California, and Fiona
Harrison and Mansi Kasliwal of Caltech. The scientists described their
research in a paper submitted to the Astrophysical Journal Letters.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation, operated under cooperative agreement by Associated
Universities, Inc. |
|
|
| Back to top |
|
|
|
| Sir Gilligan Horry... |
| Posted: Fri Oct 30, 2009 12:56 am |
|
|
|
Guest
|
On Oct 30, 11:44 pm, HVAC <mr.h... at (no spam) gmail.com> wrote:
[quote]Astronomers using the National Science Foundation's Very Large Array
(VLA) radio telescope have gained tantalizing insights into the nature
of the most distant object ever observed in the Universe -- a gigantic
stellar explosion known as a Gamma Ray Burst (GRB).
The explosion was detected on April 23 by NASA's Swift satellite, and
scientists soon realized that it was more than 13 billion light-years
from Earth. It represents an event that occurred 630 million years
after the Big Bang, when the Universe was only four percent of its
current age of 13.7 billion years.
"This explosion provides an unprecedented look at an era when the
Universe was very young and also was undergoing drastic changes. The
primal cosmic darkness was being pierced by the light of the first
stars and the first galaxies were beginning to form. The star that
exploded in this event was a member of one of these earliest
generations of stars," said Dale Frail of the National Radio Astronomy
Observatory.
Astronomers turned telescopes from around the world to study the
blast, dubbed GRB 090423. The VLA first looked for the object the day
after the discovery, detected the first radio waves from the blast a
week later, then recorded changes in the object until it faded from
view more than two months later.
"It's important to study these explosions with many kinds of
telescopes. Our research team combined data from the VLA with data
from X-ray and infrared telescopes to piece together some of the
physical conditions of the blast," said Derek Fox of Pennsylvania
State University. "The result is a unique look into the very early
Universe that we couldn't have gotten any other way," he added.
The scientists concluded that the explosion was more energetic than
most GRBs, was a nearly-spherical blast, and that it expanded into a
tenuous and relatively uniform gaseous medium surrounding the star.
Astronomers suspect that the very first stars in the Universe were
very different -- brighter, hotter, and more massive -- from those
that formed later. They hope to find evidence for these giants by
observing objects as distant as GRB 090423 or more distant.
"The best way to distinguish these distant, early-generation stars is
by studying their explosive deaths, as supernovae or Gamma Ray
Bursts," said Poonam Chandra, of the Royal Military College of Canada,
and leader of the research team. While the data on GRB 090423 don't
indicate that it resulted from the death of such a monster star, new
astronomical tools are coming that may reveal them.
"The Atacama Large Millimeter/submillimeter Array (ALMA), will allow
us to pick out these very-distant GRBs more easily so we can target
them for intense followup observations. The Expanded Very Large Array,
with much greater sensitivity than the current VLA, will let us follow
these blasts much longer and learn much more about their energies and
environments. We'll be able to look back even further in time," Frail
said. Both ALMA and the EVLA are scheduled for completion in 2012.
Chandra, Frail and Fox worked with Shrinivas Kulkarni of Caltech, Edo
Berger of Harvard University, S. Bradley Cenko of the University of
California at Berkeley, Douglas C.-J. Bock of the Combined Array for
Research in Millimeter-wave Astronomy in California, and Fiona
Harrison and Mansi Kasliwal of Caltech. The scientists described their
research in a paper submitted to the Astrophysical Journal Letters.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation, operated under cooperative agreement by Associated
Universities, Inc.
[/quote]
Love the Hollywood movie too...
"Blast From The Past"
___________________ |
|
|
| Back to top |
|
|
|
| BradGuth... |
| Posted: Fri Oct 30, 2009 3:13 am |
|
|
|
Guest
|
On Oct 30, 4:47 am, herbertglaz... at (no spam) webtv.net (G=EMC^2 Glazier) wrote:
[quote]Hagar those people that say its explosion took place 13B Earth years
ago have now got to answer this question. How old was the universe
before this explosion? Can they answer that accurately,of course not.
Even they will admit its all an if come approximation that could be off
by 25% or more. Better gamma detectors will make the universe bigger and
older in time. my approximation of 22B years will be much more accurate
in about 199 years from now. O ya Bert
[/quote]
It's much older than 22B, so you are being quite conservative.
~ BG |
|
|
| Back to top |
|
|
|
| Ben Kaufman... |
| Posted: Fri Oct 30, 2009 6:30 am |
|
|
|
Guest
|
On Fri, 30 Oct 2009 03:44:34 -0700 (PDT), HVAC <mr.hvac at (no spam) gmail.com> wrote:
[quote]Astronomers using the National Science Foundation's Very Large Array
(VLA) radio telescope have gained tantalizing insights into the nature
of the most distant object ever observed in the Universe -- a gigantic
stellar explosion known as a Gamma Ray Burst (GRB).
The explosion was detected on April 23 by NASA's Swift satellite, and
scientists soon realized that it was more than 13 billion light-years
from Earth. It represents an event that occurred 630 million years
after the Big Bang, when the Universe was only four percent of its
current age of 13.7 billion years.
"This explosion provides an unprecedented look at an era when the
Universe was very young and also was undergoing drastic changes. The
primal cosmic darkness was being pierced by the light of the first
stars and the first galaxies were beginning to form. The star that
exploded in this event was a member of one of these earliest
generations of stars," said Dale Frail of the National Radio Astronomy
Observatory.
Astronomers turned telescopes from around the world to study the
blast, dubbed GRB 090423. The VLA first looked for the object the day
after the discovery, detected the first radio waves from the blast a
week later, then recorded changes in the object until it faded from
view more than two months later.
"It's important to study these explosions with many kinds of
telescopes. Our research team combined data from the VLA with data
from X-ray and infrared telescopes to piece together some of the
physical conditions of the blast," said Derek Fox of Pennsylvania
State University. "The result is a unique look into the very early
Universe that we couldn't have gotten any other way," he added.
The scientists concluded that the explosion was more energetic than
most GRBs, was a nearly-spherical blast, and that it expanded into a
tenuous and relatively uniform gaseous medium surrounding the star.
Astronomers suspect that the very first stars in the Universe were
very different -- brighter, hotter, and more massive -- from those
that formed later. They hope to find evidence for these giants by
observing objects as distant as GRB 090423 or more distant.
"The best way to distinguish these distant, early-generation stars is
by studying their explosive deaths, as supernovae or Gamma Ray
Bursts," said Poonam Chandra, of the Royal Military College of Canada,
and leader of the research team. While the data on GRB 090423 don't
indicate that it resulted from the death of such a monster star, new
astronomical tools are coming that may reveal them.
"The Atacama Large Millimeter/submillimeter Array (ALMA), will allow
us to pick out these very-distant GRBs more easily so we can target
them for intense followup observations. The Expanded Very Large Array,
with much greater sensitivity than the current VLA, will let us follow
these blasts much longer and learn much more about their energies and
environments. We'll be able to look back even further in time," Frail
said. Both ALMA and the EVLA are scheduled for completion in 2012.
Chandra, Frail and Fox worked with Shrinivas Kulkarni of Caltech, Edo
Berger of Harvard University, S. Bradley Cenko of the University of
California at Berkeley, Douglas C.-J. Bock of the Combined Array for
Research in Millimeter-wave Astronomy in California, and Fiona
Harrison and Mansi Kasliwal of Caltech. The scientists described their
research in a paper submitted to the Astrophysical Journal Letters.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation, operated under cooperative agreement by Associated
Universities, Inc.
[/quote]
What is the source of this report?
Ben |
|
|
| Back to top |
|
|
|
| G=EMC^2 Glazier... |
| Posted: Fri Oct 30, 2009 6:47 am |
|
|
|
Guest
|
Hagar those people that say its explosion took place 13B Earth years
ago have now got to answer this question. How old was the universe
before this explosion? Can they answer that accurately,of course not.
Even they will admit its all an if come approximation that could be off
by 25% or more. Better gamma detectors will make the universe bigger and
older in time. my approximation of 22B years will be much more accurate
in about 199 years from now. O ya Bert |
|
|
| Back to top |
|
|
|
| Ahem A Rivet's Shot... |
| Posted: Fri Oct 30, 2009 8:03 am |
|
|
|
Guest
|
On Fri, 30 Oct 2009 09:25:59 -0500
"HVAC" <harlowcampbell at (no spam) gmail.com> wrote:
[quote]
"Barbara" <private at (no spam) verymuchso.org.uk> wrote in message
news:nhkle5d8a5mkip6rdr4vm5cp71t7vo9f3d at (no spam) 4ax.com...
This is just a Question. Could the Large Hadron Collider be sabotaging
itself
from the future, as some physicists say
http://www.timesonline.co.uk/tol/news/science/biology_evolution/article6879293.ece
Any ideas on this one.
Babs.
There can NEVER be time travel. Period.
No physicists would ever say it's possible.
[/quote]
Well now here are some who have in peer reviewed published papers.
Rotating cylinders and the possibility of global causality violation
FJ Tipler
Physical Review D, 1974 - APS
Wormholes, Time Machines, and the Weak Energy Condition
Michael S. Morris, Kip S. Thorne, and Ulvi Yurtsever
Phys. Rev. Lett. 61, 1446 - 1449 (1988)
--
Steve O'Hara-Smith | Directable Mirror Arrays
C:>WIN | A better way to focus the sun
The computer obeys and wins. | licences available see
You lose and Bill collects. | http://www.sohara.org/ |
|
|
| Back to top |
|
|
|
| Hagar... |
| Posted: Fri Oct 30, 2009 8:04 am |
|
|
|
Guest
|
"G=EMC^2 Glazier" <herbertglazier at (no spam) webtv.net> wrote in message
news:12221-4AEAE072-28 at (no spam) storefull-3251.bay.webtv.net...
[quote]Hagar those people that say its explosion took place 13B Earth years
ago have now got to answer this question. How old was the universe
before this explosion? Can they answer that accurately,of course not.
Even they will admit its all an if come approximation that could be off
by 25% or more. Better gamma detectors will make the universe bigger and
older in time. my approximation of 22B years will be much more accurate
in about 199 years from now. O ya Bert
[/quote]
Well, Beeper, the very first stars formed about 200 million years after the
Big Bang. They also were all Super giants, since their composition was that
of the new coalesced cosmic soup, containing 75% Hydrogen, 23% Helium and 2%
Lithium, Beryllium and a trace of Boron.
Since these are the lightest of elements, it took a gigantic ball of them to
muster the gravitational force required to start fusion. Also, since they
contained no impurities (heavier elements, metals etc), they burned at an
unprecedented rate and exhausted their internal fuel up to the iron stage in
around 100 to 250 million years, when they all went Supernova, seeding the
Cosmos with the necessary elements to form second generation stars and also
the very first planets.
So, the event just seen could, in theory, have occurred about 300 million
years after the Big Bang. The calculated age of the Universe, even taking
into consideration its recently discovered accelerated expansion, is still
around 13.5 to 14 Billion years. |
|
|
| Back to top |
|
|
|
| HVAC... |
| Posted: Fri Oct 30, 2009 8:23 am |
|
|
|
Guest
|
"Ben Kaufman" <spaXm-mXe-anXd-paXy-5000-dollars at (no spam) pobox.com> wrote in message
news:93nle51s9fe3bkl82bofv3n1c0p3e8jcoq at (no spam) 4ax.com...
[quote]
What is the source of this report?
Ben
[/quote]
Google |
|
|
| Back to top |
|
|
|
| HVAC... |
| Posted: Fri Oct 30, 2009 8:25 am |
|
|
|
Guest
|
"Barbara" <private at (no spam) verymuchso.org.uk> wrote in message
news:nhkle5d8a5mkip6rdr4vm5cp71t7vo9f3d at (no spam) 4ax.com...
[quote]This is just a Question. Could the Large Hadron Collider be sabotaging
itself
from the future, as some physicists say
http://www.timesonline.co.uk/tol/news/science/biology_evolution/article6879293.ece
Any ideas on this one.
Babs.
[/quote]
There can NEVER be time travel. Period.
No physicists would ever say it's possible. |
|
|
| Back to top |
|
|
|
| G=EMC^2 Glazier... |
| Posted: Fri Oct 30, 2009 9:50 am |
|
|
|
Guest
|
BG When youget older your thinking becomes more conservative. still i
could never be so conservative to be a republican. Bert |
|
|
| Back to top |
|
|
|
| G=EMC^2 Glazier... |
| Posted: Fri Oct 30, 2009 9:53 am |
|
|
|
Guest
|
To Ya all Having welded with a 12 volt battery it was not hard for my
prediction to come true that this accelerator would melt down booting
up. bert |
|
|
| Back to top |
|
|
|
| G=EMC^2 Glazier... |
| Posted: Fri Oct 30, 2009 10:06 am |
|
|
|
Guest
|
Hagar For super dense massive stars to be the first stars after the BB
does not really tell time lapses,as thinking astronomers will admit Go
figure Bert |
|
|
| Back to top |
|
|
|
| Pablo... |
| Posted: Fri Oct 30, 2009 10:39 am |
|
|
|
Guest
|
El Fri, 30 Oct 2009 09:25:59 -0500, HVAC escribiĆ³:
[quote]There can NEVER be time travel. Period.
[/quote]
Heh. One never knows...
--
Pablo |
|
|
| Back to top |
|
|
|
| Saul Levy... |
| Posted: Fri Oct 30, 2009 10:49 am |
|
|
|
Guest
|
Tipler's A RELIGIOUS KOOK, HVAC! lmfjao! The ANTHROPIC PRINCIPLE
which LIAR B gets HIS SOCKS OFF FOR?
NEVER mix science and religion. BAD IDEA!
Saul Levy
On Fri, 30 Oct 2009 12:15:12 -0500, "HVAC" <harlowcampbell at (no spam) gmail.com>
wrote:
[quote]
"Ahem A Rivet's Shot" <steveo at (no spam) eircom.net> wrote in message
news:20091030140334.cc35095f.steveo at (no spam) eircom.net...
There can NEVER be time travel. Period.
No physicists would ever say it's possible.
Well now here are some who have in peer reviewed published papers.
Rotating cylinders and the possibility of global causality violation
FJ Tipler
Physical Review D, 1974 - APS
Great. A 35 year old treatise with more holes
than my old socks.[/quote] |
|
|
| Back to top |
|
|
|
| Ahem A Rivet's Shot... |
| Posted: Fri Oct 30, 2009 11:04 am |
|
|
|
Guest
|
On Fri, 30 Oct 2009 12:15:12 -0500
"HVAC" <harlowcampbell at (no spam) gmail.com> wrote:
[quote]
"Ahem A Rivet's Shot" <steveo at (no spam) eircom.net> wrote in message
news:20091030140334.cc35095f.steveo at (no spam) eircom.net...
There can NEVER be time travel. Period.
No physicists would ever say it's possible.
Well now here are some who have in peer reviewed published papers.
Rotating cylinders and the possibility of global causality violation
FJ Tipler
Physical Review D, 1974 - APS
Great. A 35 year old treatise with more holes
than my old socks.
[/quote]
Last I checked there weren't considered to be any holes in that
paper, please enlighten me with a reference or two.
There are of course holes in the various optimistic suggestions that
it may be possible to achieve the same effect with a finite length
cylinder, and I believe a reasonably solid proof that the edge effects
cannot be ignored or compensated so it really does need an infinite length
cylinder.
--
Steve O'Hara-Smith | Directable Mirror Arrays
C:>WIN | A better way to focus the sun
The computer obeys and wins. | licences available see
You lose and Bill collects. | http://www.sohara.org/ |
|
|
| Back to top |
|
|
|
|
|
All times are GMT - 5 Hours
The time now is Mon Dec 14, 2009 11:20 pm
|
|