The Pioneer Anomaly |
The Pioneer Anomaly |
Aug 16 2005, 04:27 PM
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
http://www.planetary.org/news/2005/pioneer_anomaly_faq.html
The planetary society may be checking it out... QUOTE The Planetary Society has committed to raise the funds to preserve the priceless Pioneer data from destruction.
After years of analysis, but without a final conclusion, NASA, astonishingly, gave up trying to solve the "Pioneer Anomaly" and provided no funds to analyze the data. The Pioneer data exists on a few hundred ancient 7- and 9-track magnetic tapes, which can only be read on "antique" outdated computers. The agency is going to scrap, literally demolish, the only computers able to access and process that data in the next few months! |
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Sep 9 2005, 07:45 AM
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
It has been hoped that cosmic sources of gravitational radiation (as opposed to supernovae and massive object collissions) are stronger than predicted, or that there's unpredicted sources that have relatively frequent events strong enough for the first generation LIGO detection systems, but basically nobody expects it. Detectors have gotten much better than Weber's original cylinders, but my impression is that expectations of predicted source strength-frequency combinations have been such that no detector so far has been expected to detect anything by the general gravitational wave community. LIGI, I believe, works at much too high a frequency for detecting big bang related radiation and the like.
As far as SN1987A goes, we're detecting the blast wave interacting with the inner edge of a lumpy ring which is progressively lighting up as the blast expands. There is still no trace of either a black hole or neutron star in the supernova remenant inside the ring, or of energy being emitted from one. Some models in the past have suggested that in some cases there may be nothing left, but those I think are in disrepute, so the non-observation of a massive object is "A Puzzlement" |
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Guest_Richard Trigaux_* |
Sep 9 2005, 08:17 AM
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#3
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Guests |
QUOTE (edstrick @ Sep 9 2005, 07:45 AM) As far as SN1987A goes, we're detecting the blast wave interacting with the inner edge of a lumpy ring which is progressively lighting up as the blast expands. There is still no trace of either a black hole or neutron star in the supernova remenant inside the ring, or of energy being emitted from one. Thanks for the info, edstrick. The lumpy ring you speak about is the innermost of the three rings, the one which is coplanar with the star. QUOTE (edstrick @ Sep 9 2005, 07:45 AM) Some models in the past have suggested that in some cases there may be nothing left, but those I think are in disrepute, so the non-observation of a massive object is "A Puzzlement" Yes there are some models predicting a nuclear explosion of the star, without gravitationnal collapse. In this case all the mass is blasted away and nothing remains in the centre. But this is for peculiar cases of binary stars, I do not think it fits for SN1987A, which is believed to be basically a gravitationnal collapse of a massive star which exhausted all its nuclear power. But the process leading from a star to a neutron star or black hole is not yet understood. The only thing sure is that there was a blast of neutrinos detected, indicating very high temperatures reached in the core. But we do not know if a black hole or a neutron star was created. By the way this star was not very massive, it could have given only a white dwarf (an idea of mine, without any waranty). I remember that the detection of a blinking light was expected 10 years after. Now 18 years passed by... |
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