Shpaget
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Posts posted by Shpaget
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A media briefing on UFOs is about to start
QuoteThis media briefing is a discussion about the report published by the unidentified anomalous phenomena independent study team we commissioned in 2022.
The team’s report aims to inform us on what possible data could be collected in the future to shed light on the nature and origin of UAPs. Briefing participants include:
· NASA Administrator Bill Nelson
· Nicola Fox, associate administrator, Science Mission Directorate, NASA Headquarters in Washington
· Dan Evans, assistant deputy associate administrator for research, NASA’s Science Mission Directorate
· David Spergel, president, Simons Foundation and chair of NASA’s UAP independent study teamThe UAP independent study team is a counsel of 16 community experts across diverse areas on matters relevant to potential methods of study for UAP. We commissioned the nine-month study to examine UAP from a scientific perspective and create a roadmap for how to use data and the tools of science to move our understanding of UAP forward. Right now, the limited high-quality observations of UAP make it impossible to draw scientific conclusions from the data about the nature of such events.
More info on the independent study team, including frequently asked questions: https://science.nasa.gov/uap
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Then there is also Zipline. They do amazing stuff.
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So what solution to what problem have you found?
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Combustion is necessarily a chemical reaction, so I don't see how electricity play into your proposal. Are you proposing an electrical heater to heat a some inert fluid and achieve thrust that way, without a chemical reaction? Something line NERVA, but electrical? But in that case, there is no combustion.
In cars, planes, ships, etc. we use chemical reactions instead of batteries because they are much more energy dense. Nuclear fission is even more dense than energy you can get out of chemical reactions.
3 hours ago, Spacescifi said:Question: Is it not true that even if we had compact super batteries, the discharge of electrical energy needed to combust propellant on par with a chemical or solud rocket would cause X-rays?
It's a guess, since I read somewhere online that in Back to the Future the Time Machine car is really a death mobile, since the sheer number of watts it is putting out would give off X-rays and kill the passengers.
First time I hear this. Production of X rays is tied to the method of energy release, not magnitude. A simple forest fire releases a tremendous amount of energy, but no X rays. As for DeLorean, it will produce as much X rays as the plot requires.
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58 minutes ago, steve9728 said:
most viable, cheapest, and most convenient
Fixed wing with internal combustion engine.
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Even if these panels had zero mass and volume, there is not nearly enough surface available to get a meaningful power level. It's not a case of close but not quite enough. It's orders of magnitude away from enough.
As for exactly how much you would get, multiply the surface area of the drone you have in mind with 50 mW/m^2 and there's your answer.
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No, just no. So much wrong here.
50 mW (milliwatt, no / in there) figure is per one meter squared. That's liquid all.
Where does this 100-200 megawatt figure come from? I don't see it in the article.
Conservative figures are 100-200 W/m^2 of regular solar panel production (watts, not megawatts; again per square meter).
Charge a car with this? Yeah, not gonna happen. To charge a Tesla model 3 in 12 hours, you would need to have about 100 000 m^2 of these panels. That's about 100 000 ^2 more than what you have available on a car.
Can it power a drone continuously? Of course not. For example, a DJI Mavic (a small drone) has a stated battery capacity of 43,6 Wh and flight time of 27 minutes, meaning that it consumes about 100 W. To power it by these night panels, you would need 2000 m^2 of them.
This is a gimmick. The energy these panels allegedly produce during the 12 hours of night, equals to about 20 seconds of production during the day. If you need power during the night, but it is such low demand, just put a tiny rechargeable battery in you device and be done with it.
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Formula is
v=a*t, so 7,3392 *600 = 4 403,52
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3 hours ago, Exoscientist said:
Could you mine all the resources needed for space exploration from space itself?
Of course you can, given a sufficiently loose definition of "space". If we only look at elements, composition of Earth is nothing special, however, some materials such as organic compounds might be worth shipping from Earth.
Even if you can devise a convoluted chain of reactions to get whatever plastic you need from raw elements, it would probably be much much simpler to just use well established processes and get it from oil (as in, use existing factories and just ship it to your space outpost). Industrial processes we use today benefit a lot from having near infinite access to almost free water, be it for cooling or as solvent. Same goes for air and any other chemical that is available with same day shipping.
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On 8/31/2023 at 6:19 PM, sevenperforce said:
I'm not sure why you're always afraid of things melting.
I wonder that too. I would imagine that during the engine design phase, thermal management would be something to consider.
Also, why would the chamber pressure be to high or nozzle too small? Again, those things should be solved during the design phase, unless you are assembling a rocket engine from assorted parts you find at a spaceship scrap yard; parts that were never meant to go together. Do you worry about what would happen if the piston in your car was too small for the cylinder?
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Graph on the link shows 50 degrees at surface and a near perfectly linear drop with depth. I'm not sure what to make of the blip above the surface since measuring the temperature of vacuum is a bit moot.
The major difference with these measurements and the ones you would find on Earth is just how quickly the temperature drops, but that is something I would easily attribute to loose rocks with lots of vacuum between them, as opposed to air and water you would find in Earth soil, both of which are much better at conducting heat.
Don't get me wrong, I'm happy to have more data available, but I don't consider this to be a ground breaking discovery. Well, other than the actual breaking of the lunar ground.
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Why would a stable temperature under the surface be something that is unexpected?
I would be much more excited and surprised if it was the other way around.
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An average guy has surface area of about 2 m^2. Since even Superman can only have one side facing the Sun, this puts the upper limit of solar power received to about 1 kW on Earth surface (about 1300 W in orbit). Presumably he spends half the time on the night side of the Earth, so total energy harvesting is capped at about 12 kWh per day. If that is enough to allow him to do all the Superman stuff, there is your answer. My vacuum cleaner is about twice as powerful.
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15 minutes ago, Hannu2 said:
But as you said, such material would be excellent heat sink for all imaginable purposes.
But that is only one half of conservation of energy violation (magically sidestepped by exhausting hydrogen).
The other half is when this material is warmer than environment. Does it absorb hydrogen in this case? What if there is none available?
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Sixto Rodriguez, aka Sugar Man
https://www.bbc.com/news/entertainment-arts-66449150.amp
Even if you haven't heard about him, go watch Searching for Sugar Man. It's a great movie and an incredible story.
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17 hours ago, Superfluous J said:
I have paid for several video editors over the years, but in the end I settled on a free video editor named ShotCut. I don't think I'll ever use anything else.
I used it on a few projects several years ago and while it eventually delivered, it was notoriously unstable, crashing several times per day. Have the new versions made it more stable?
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2 hours ago, Elthy said:
where did you see any excavation? I only saw lots of vapor, nothing to assess the pad structure...
One the video tater linked on the previous page, timestamp 3:10 there seem to be some big rocky things beyond the pad. Could be unrelated, or due to water erosion.
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13 hours ago, RCgothic said:
Apparently it was a 9-engine static fire, so 4 early shutdowns is near 50% followed by an early test finish.
I was glad to see a significant reduction in excavation, thinking they tested all engines, but if this was only 5/33 of power that's still a bit too pad-rich exhaust.
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Obligatory IANAHVACT (I am not a HVAC technician), but I had a displeasure of unclogging a few algae boogers in AC units. Mechanical agitation always worked wonders. If you have access to the drain pipe that goes from the drip pan to the big outdoors, just shove a soft wire the wrong way. As richfiles says, they are soft and will easily break apart into chunks that can fit the drain pipe. Wear gloves since the boogers will come at ya!
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Technically, we kept on receiving the carrier signal, so maybe no hijack.
Rewatching the ST:TMP, just in case.
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17 minutes ago, Jacke said:
As I said elsewhere: Until there's a full process published that allows independent recreation and it's recreated, it's a fake.
We already have claims of independent replication and positive results.
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Quote
"The Deep Space Network used the highest-power transmitter to send the command (the 100-kw S-band uplink from the Canberra site) and timed it to be sent during the best conditions during the antenna tracking pass in order to maximize possible receipt of the command by the spacecraft," Voyager project manager Suzanne Dodd told AFP.
37 hours of waiting to see if Vger received the message.
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A bit of an update on this front:
Sinéad M. Griffin from Lawrence Berkeley National Laboratory published and article on arXiv where she does a computer analysis of the compound. Her results are in favor of superconductivity.
Folks at Huanzhong Univesity claim to have replicated the material, and that their sample shows Meissner effect, which is a sign of superconductivity.
https://www.nextbigfuture.com/2023/07/tracking-lk-99-superconductor-replication-efforts.html
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1 hour ago, Exoscientist said:
Why would it be reasonable to omit it specifically to the lunar South Pole when it is included on every other mission to any other space body by any country, including the U.S. other than this location?
You make it sound like the reason not to include it was the fact that it goes to the South Pole. Soil samples have been taken and analyzed multiple times already. We already have a pretty good idea of what more of those test would come up with. This mission is different and tests for something that hasn't been tested nearly as extensively - volatiles, that's what the "V" in the name is for.
Sure, it would be great if we could send an entire analytical lab with every lander that goes anyplace, but there are always restrictions on mass and budget. I'd be willing to bet an entire bag of gummy bears that the main reason metal detectors didn't make the cut was mass budget.
Scifi Fun With Inertial Negators....
in Science & Spaceflight
Posted
If you want to blatantly break laws of physics and make perpetuum mobile in your fiction possible, go for it.
Just keep in mind that everything we currently know about universe says this can't work in reality.