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SETI@home Science :
What am I doing?
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Jenna Ware Send message Joined: 21 Mar 12 Posts: 6 Credit: 1,118,050 RAC: 0 |
Everyone. I am wondering about a couple of things? Perhaps someone can help me? 1. My computer has done about 830,000 tasks, I guess it is. Can someone explain to me what that is? Does that mean analyzed 830,000 signals or parts of signals? and 2. Are these signals likeunto analyzing a singular radio signal? Because I find myself wondering if it could be possible for a species to send a radio signal, but bits of the signal over different frequencies at the same time (broad band), so it'd go out faster, etc. If so then analyzing one-freq signals would likely miss something, wouldn't they? I'm just wondering if someone can help me understand here? Thank you Jenna |
tullio Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 |
Astropulse is exploring a wider bank of frequencies than Multibeam. Tullio |
Bob DeWoody Send message Joined: 9 May 10 Posts: 3387 Credit: 4,182,900 RAC: 10 |
Your computer is sent a batch of raw data that was recieved by the Arecibo radio telescope which is mainly space noise. You computer is loaded with a software package that analyzes the raw data looking for evidence of any pattern that might be of non natural origin. If found the signal would be cross checked with other batches from the same area of the sky. Bob DeWoody My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events. |
rob smith Send message Joined: 7 Mar 03 Posts: 22149 Credit: 416,307,556 RAC: 380 |
We may not be able to buy a telescope, but one day one of us will get that ever so elusive toaster.... Bob Smith Member of Seti PIPPS (Pluto is a Planet Protest Society) Somewhere in the (un)known Universe? |
Jenna Ware Send message Joined: 21 Mar 12 Posts: 6 Credit: 1,118,050 RAC: 0 |
So my computer, here has done about 850,000 somethings we refer to as "credits," and that is a measure of the amount of work it's done? Aricebo: I'm thiking "Carl Sagan" and "Jodi Foster"? But how large of a signal are the bits my computer are measuring? LIttle bits of single-frequency signals? Or is it also comparing other signals that might be happening at the same time (like as if it were a broadband signal)? I'm just curious. It churns away over there... Thank you Jenna |
bluestar Send message Joined: 5 Sep 12 Posts: 6979 Credit: 2,084,789 RAC: 3 |
Perhaps you meant to say Jodie Foster? There was a great picture of her besides one of the antennae receivers being used by Seti@home. For now, I do not know where that picture is located. My best guess is that each individual Seti@home task are separate from each other, but that they may be related to each other over time based on the position in the sky. The numbers being obtained from a given task is perhaps not a direct representation of a given signal should one such happen to exist, even though a specific frequency range is being analyzed for each such task. Gaussians are being part of the detection mechanism in Seti@home tasks because the algorithm being used analyzes the data and tries to determine a "best-shaped" gaussian curve from what is present in the data, assumedly spikes and pulses, which most are supposed to be occurring naturally. We unfortunately happen to be are using the radio waves here as well. We are being hampered by the everyday use of everything which involves communication. Also nature has its own radio sources, like Jupiter, the Sun, the Crab Nebulae M1 and the elliptical radio galaxy M87 in the center of the Virgo Cluster. An example of an intelligent signal which we chose to broadcast ourselves into space happened already back in 1973. This transmission was in the direction of the globular cluster M13. Any receiver in the other end probably will be become very excited about getting such a signal. |
OzzFan Send message Joined: 9 Apr 02 Posts: 15691 Credit: 84,761,841 RAC: 28 |
Jodi Foster had her picture taken next to the Allen Telescope Array, which is not one of the satellites SETI@Home uses; that's what the SETI Institute uses. |
Mr. Kevvy Send message Joined: 15 May 99 Posts: 3776 Credit: 1,114,826,392 RAC: 3,319 |
BOINC credit. A brief (I hope) explanation: 1 GFlOp = 1 billion floating point operations/calculations per second.... how fast your CPU (or video GPU) works. The BOINC credit, the "Cobblestone" (so named as invented by Jeff Cobb, a play on the "Whetstone" term for benchmarking processing speed) is: a 1 GFlOp computer working a full day of 24 hours will do 200 Cobblestones' worth of calculations, so earn 200 credits. So each Cobblestone/BOINC credit point is (1 billion ops per second x 24 hours per day x 3600 seconds per hour) / 200 = 432 billion floating point operations (this also nicely illustrates just how inexpensive computing is these days.) Your RAC (recent average credit) is 5,676, so your computer is doing 5,676 / 200 = about 28 GFlOps, 28 billion floating point operations per second. Hope this is correct... haven't had my coffee yet. :^) |
Bernie Vine Send message Joined: 26 May 99 Posts: 9954 Credit: 103,452,613 RAC: 328 |
There was a great picture of her besides one of the antennae receivers being used by Seti@home. For now, I do not know where that picture is located. Do you mean this one?? |
tullio Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 |
There was a great picture of her besides one of the antennae receivers being used by Seti@home. For now, I do not know where that picture is located. This is Arecibo. tullio |
John Neale Send message Joined: 16 Mar 00 Posts: 634 Credit: 7,246,513 RAC: 9 |
But how large of a signal are the bits my computer are measuring? LIttle bits of single-frequency signals? Or is it also comparing other signals that might be happening at the same time (like as if it were a broadband signal)? Jenna, I suggest you start by having a look at the "About SETI@home" page. In particular, although a bit dated, there is a detailed description in "Learn more about how SETI@home works" of how the data are obtained from the radio telescope at Arecibo in Puerto Rico, how they are converted into the work units that you and I process, and much more. The Astropulse FAQ is a useful starting point for learning about the broadband searches performed in this part of the project. There is also a more detailed description of the Astropulse science. |
bluestar Send message Joined: 5 Sep 12 Posts: 6979 Credit: 2,084,789 RAC: 3 |
Great picture of Jodie Foster there. Better than the first one I saw. I happened to come across a reference to an earlier Seti@home signal candidate, SHGb11+15a. So I tried google it for more information and found this web-page, http://science.slashdot.org/story/03/12/08/1723225/seti-project-scientist-discusses-prospects having a little more. So the reference goes to http://setiathome.ssl.berkeley.edu/Candidates/SHGb11+15a/gaussian_profiles.html which obviously is wrong. I do not get access there. Rather try out http://setiaclassic.ssl.berkeley.edu/Candidates/SHGb11+15a/gaussian_profiles.html instead. Have a look at the nearby gaussians included there. Also the pulses as well. Is this signal a gaussian itself. What is its signal curve? What is the power, fit and score for this signal candidate and what makes it better or different than other gaussians which may be present? If you happen to know, please tell me. Perhaps others want an explanation as well regarding this subject. |
Jenna Ware Send message Joined: 21 Mar 12 Posts: 6 Credit: 1,118,050 RAC: 0 |
Ok. Wow. I got lots of information. I am truly more of a groupie than a genius. I have a Caltech shirt. If worn, someone might ask, "Did you got to Caltech?" I'd answer, "Yes. To get this shirt." I do go visit sometimes as I have connections there. But truly, I'm a liberal arts groupie. I watch the "Big Bang Theory." I've enjoyed "Real Genius," with Val Kilmer. I've enjoyed "Contact," and "Star Trek." But I'm little more, here, in the genius department, than Penny is on BBT. Sooooooooo............. Now that I asked my hard question: I am totally confused. I don't know what I"m doing, but I'm guessing it's good. My appreciation for alien life is grand, and perhaps I'm helping in that search, which is good. Thank you for your attempt to explain. Were we to meet an alien--hopefully more like the Vulcans of Cochran's first flight and less like the ones in "Aliens"--I think I'd enjoy learning about them. But I doubt I'll be able to contribute to the science of finding them, other than devote a laptop to it. So thank you for your help, guys. If you need to program their computer with one of our viruses, so we can fend off an invation, I'll be the one serving the pizza. Ciao. |
OzzFan Send message Joined: 9 Apr 02 Posts: 15691 Credit: 84,761,841 RAC: 28 |
If you need to program their computer with one of our viruses, so we can fend off an invation, I'll be the one serving the pizza. As an expert in IT, I have to tell you (even though I know you meant this light-heartedly, but others may not know this) that doing so would be nearly impossible to be done in time to save our world from invasion. Writing a computer program, whether it be a helpful one or a virus/trojan, requires intimate knowledge of the hardware you're writing for. For us, many programmers simply allow the compiler to do all the hard work of translating code into machine language - but someone had to write that compiler to do the translating. If an alien race were ever to invade a la Independence Day, I would hazard an educated guess that their technology would be so far advanced compared to our own that it would possibly take decades or longer to figure it's ins and outs - assuming we got a hold of their technology to reverse engineer it. I love the movie, but this is one bit that has always 'bugged' me (pun intended). I have the same level of complaint against other TV shows I watch these days (the ones constantly mentioning multiple "firewalls" as the best line of computer defense). Anyway, glad you got your information (even if I was wrong about the satellite and Jodie Foster), and keep enjoying that Big Bang Theory, it has some educational bits in there if you pay attention! :-D |
GALAXY-VOYAGER Send message Joined: 21 Oct 12 Posts: 85 Credit: 157,743 RAC: 0 |
Regarding Jodi Foster. Arecibo was in The Movie 'CONTACT' with Jodie Foster as Ellie Arroway. Just after the Movie Started (and Ellie was shown as a young Woman - Jodie foster), she stood below Areciboand looked up at it. The S.E.T.I. Program started at Arecibo, where The character of Ellie arroway began working on The S.E.T.I. Project, until The Program was Closed down. it was then that they moved to The Allen Telescope Array. This LINK shows a couple of Photos of her at ARECIBO http://www.naic.edu/tony/contact.htm GALAXY-VOYAGER |
GALAXY-VOYAGER Send message Joined: 21 Oct 12 Posts: 85 Credit: 157,743 RAC: 0 |
The Photo of Jodie at the Allen telescope Array is the one on The Cover of The CONTACT DVD. GALAXY-VOYAGER |
GALAXY-VOYAGER Send message Joined: 21 Oct 12 Posts: 85 Credit: 157,743 RAC: 0 |
But how large of a signal are the bits my computer are measuring? LIttle bits of single-frequency signals? Or is it also comparing other signals that might be happening at the same time (like as if it were a broadband signal)? The Description of The Screensaver and How it Works gives a fair idea of it too. GALAXY-VOYAGER |
Michael Watson Send message Joined: 7 Feb 08 Posts: 1383 Credit: 2,098,506 RAC: 5 |
Actually, it was the VLA (Very Large Array) radio telescope in New Mexico that appeared in Contact, not the Allen Telescope Array (ATA). Contact was released in 1997. Construction didn't begin on the ATA until 2004. |
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