1) Message boards : SETI@home Science : Arecibo Observatory (Message 2089402) Posted 1 Dec 2021 by Earthcore Post: Arecibo Observatory: A year after telescope's collapse, an icon gets continuing cleanup and a new documentary. By Meghan Bartels, 1 DEC 2021, Space.com. https://www.space.com/arecibo-radio-telescope-collapse-anniversary

2) Message boards : SETI@home Science : Arecibo Observatory (Message 2084830) Posted 23 Sep 2021 by Earthcore Post: A replacement for Arecibo planetary radar with better resolution? Tycho Crater of the Moon Revealed in Intricate Detail: Powerful new radar technology will reveal the secrets of the solar system. https://remonews.com/canada/tycho-crater-of-the-moon-revealed-in-intricate-detail-powerful-new-radar-technology-will-reveal-the-secrets-of-the-solar-system/

3) Message boards : SETI@home Science : Arecibo Observatory (Message 2080709) Posted 23 Jul 2021 by Earthcore Post: Scientists want to build a new, very different Arecibo Telescope to replace fallen icon. By Meghan Bartels - July 22, 2021, Space.com https://www.space.com/arecibo-telescope-replacement-process-and-designs

4) Message boards : SETI@home Science : Arecibo Observatory (Message 2066481) Posted 23 Jan 2021 by Earthcore Post: Arecibo replacement could support space situational awareness By Jeff Foust — January 22, 2021, SPACENEWS https://spacenews.com/arecibo-replacement-could-support-space-situational-awareness/

5) Message boards : News : Why do people run SETI@home? (Message 2037731) Posted 13 Mar 2020 by Earthcore Post: I have run SETI@Home myself since 2013 because I wanted to support the progress of basic science and since I think it is a waste of capital to leave my old computers just on the shelf. Why SETI@Home? Astronomers have made some of the most fascinating discoveries of the last century that have significantly increased our knowledge of and understanding of our place in the universe. Yet astronomers are poor (underfunded) scientists. Observing intelligent life on exoplanets is a next step that has been even more difficult to finance on scientific grounds. I would like to thank everyone at SETI for the good work done over the years, enthusiasm and the perseverance needed in all research.  Hope you find ET in the end. For anyone looking for an alternative to SETI@Home, my advice is to support Einstein@Home or other Astronomy & Astrophysical BOINC projects.

6) Message boards : News : SETI@home hibernation (Message 2035825) Posted 4 Mar 2020 by Earthcore Post: RIP SETI@home -  probably replaced by a more efficient AI for future data collection that can eliminate all natural sources of all signal energy out there.

7) Message boards : SETI Perspectives : What to Expect from ET? (Message 2021660) Posted 4 Dec 2019 by Earthcore Post: A more realistic but still optimistic power level would be search for signals 30 (40) dB lower than TW. This aside from the almost non-existent possibility of seeing a gigantic planetary radar if it exist. 30 dB lower with todays sesitivity is a distance 1.56 pc,  5 lightyears, i.e. not many stars. The way to increase sensitivity to 50 pc is likely to add effective antenna area through  Very-long-baseline interferometry (VLBI) and using coherent integration. The same technologi used to get a picture of the black hole. A slow but effective process that requires bigger international commitment. Please comment if correct or incorrect assumptions.

8) Message boards : SETI Perspectives : What to Expect from ET? (Message 2021216) Posted 30 Nov 2019 by Earthcore Post: I have read "The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars over 1.10–3.45 GHz", June 17, 2019 where it says that: "The EIRPmin for our GBT observations is 2.1×10^12 W, and 9.1 × 10^12 W for Parkes observations at the 50 pc maximum distance. We find no evidence for narrowband transmitters from observations of our target stars above the EIRPmin values of 2.1 × 10^12 W for GBT observations and 9.1 × 10^12 W for Parkes observations." We can't expect ET to use TW transmitters rather kW to MW. Even with power added from many out of phase transmitters it is impossible to reach TW. Resulting in a very limited maximum detection distance beyond which BL resources are wasted in search of ET. Have I interpreted the results correctly?

9) Message boards : SETI Perspectives : The Drake Equation: Revisiting a Classic Tool to Estimate the Odds of Contact (Message 2000094) Posted 28 Jun 2019 by Earthcore Post: Richard M Lawn wrote  "The range of uncertainty of L swamps that of all the other factors in the Drake Equation. This is perhaps the greatest value of the exercise. 500 and 5 million years =>  N =  31 to 310 000." I think we have the "big filter" in front of us because of natural causes.  We have an exponential growth in population, resource utilization (such as food, energy etc.) and also pollution. 100 years ago the world had less than 2 billion in population.  Today I think we have less than 100 years before we hit the roof and society as we know it totally collapses. Estimates L to 200 years leading to N = 12, i.e about the same as R. The chance to find 12 civilizations among all stars in the Milky Way galaxy that have earthly planets is almost non-existent, considering distances, radio free space loss and that more technologically advanced with time uses less emitted power. Still we have to try and maybe we also contribute to other science.

10) Message boards : SETI@home Science : Could we communicate via radiowaves through interstellar space? (Message 1861612) Posted 15 Apr 2017 by Earthcore Post: I think we humans not only will communicate but also explore the universe beyond interstellar space. The means of doing that is quantum communication, i.e through entanglement, and sending small robotic spacecrafts. Probably also Van Neumann probes for planetary research whose information can be relayed home by quantum satellites. That will give us the tools of observing and collecting knowledge in near real time regardless of distances long before we can travel ourself.

11) Message boards : Number crunching : Intel GPU Validation Inconclusive (Message 1808772) Posted 12 Aug 2016 by Earthcore Post: OK, but maybe someone in the project should talk with Intel to fix this problem.

12) Message boards : Number crunching : Intel GPU Validation Inconclusive (Message 1808768) Posted 12 Aug 2016 by Earthcore Post: After upgraded Intel HD Graphics 520 driver today, to 2016-07-25 version 21.20.16.4494, all work-units ends up with Computation Error (i.e. Beräkningsfel). SETI@home 8.12 SETI@home v8 (opencl_intel_gpu_sah) 06mr09af.1650.18882.5.32.83_2 00:00:01 (00:00:01) 84,94 100,000 - 2016-10-04 11:14:45 0,00581C + 1 Intel GPU Beräkningsfel (5,) What's wrong?

13) Message boards : News : Arecibo still threatened with closure. (Message 1797779) Posted 21 Jun 2016 by Earthcore Post: Thank you for correcting me regarding Arecibo tracking capability. But the conclusion stands. To get better sensitivity much longer integration time is needed. That will probably require development of a new receiver, data collection/storage and software for SETI@home, maybe as part of the Breakthrough Initiative.

14) Message boards : News : Arecibo still threatened with closure. (Message 1797597) Posted 20 Jun 2016 by Earthcore Post: If I calculate correctly Arecibo has about 10 dB more gain than Green Bank. Looking after modulated CW signals by cross correlation of two parallel receiver channels on the same frequency to get rid of the remaining noise it is then possible to do integration. Instead of integrating during 12 seconds, the time for a celestial object to travel the duration of the Arecibo dish, it should be possible with Green Bank looked on target to integrate up to about 40800 seconds per day, i.e. with Green Bank it should be possible to reach a lot further into space. Also for pulsed signals Green Bank have the advantage after post processing. In both cases of course you have to handle Radio Frequency Interference (RFI) another way. Still I will vote for more time on Green Bank not Arecibo.

15) Message boards : Number crunching : Intel GPU Validation Inconclusive (Message 1795361) Posted 11 Jun 2016 by Earthcore Post: I have the same problem with i5-6200U Skylake and Intel HD Graphics 520 OpenCL 2.0 Intel may have a bug in their GPU in terms of floating point processing?

16) Message boards : Science (non-SETI) : Very cool NASA video (Message 1500110) Posted 5 Apr 2014 by Earthcore Post: Failure is no option – FTL the engineering challenge of the millennium. http://www.youtube.com/watch?v=9M8yht_ofHc

17) Message boards : Science (non-SETI) : Is the Universe One Giant Hologram? (Message 1474505) Posted 9 Feb 2014 by Earthcore Post: Video link to an interesting discussion http://www.youtube.com/watch?v=NsbZT9bJ1s4

18) Message boards : Science (non-SETI) : Earliest Signs of Life on Earth (Message 1458183) Posted 28 Dec 2013 by Earthcore Post: Reflecting on the development of life. SETI should implement a search strategy of the nearest neighbors first if we are ever to find ET. Nor any idea of wasting resources on galaxies 1-2 billion light years away.

19) Message boards : Science (non-SETI) : Earliest Signs of Life on Earth (Message 1457598) Posted 26 Dec 2013 by Earthcore Post: Fermis paradox explained. We are among the first. Interesting link. http://www.technologyreview.com/view/513781/moores-law-and-the-origin-of-life/

 
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