Shpaget

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.

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?

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.

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?

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.

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.

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!

Technically, we kept on receiving the carrier signal, so maybe no hijack. Rewatching the ST:TMP, just in case.

We already have claims of independent replication and positive results.

https://www.ndtv.com/world-news/nasa-restablishes-full-contact-with-voyager-2-after-interstellar-shout-4271069 37 hours of waiting to see if Vger received the message.

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

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.

They claim no - standard one atmosphere. In addition to their less than pristine reputation regarding previous publications (I know, I know, ad hominem and all that), one of the videos on their website shows their experiment with a sample hanging on a string and being manipulated by a moving magnet. The thing is, the sample is bonded to a thick copper plate which would be more than enough to produce the effect shown, all on its own, no supreconductivity needed, just plain old eddy currents. I might chalk that up to an honest mistake had the experiment been done by amateurs, but someone working on superconductors should immediately see the issue and not overlook this.

Is the problem in question your fault? What happens if you don't meet the deadline? Does an entire town end up without drinking water for a month, does somebody die, does the world end, or is it just a matter of somebody else not making as much of a profit? These are the questions I answer myself when faced with similar situations, and usually I end up actually having a relaxing weekend. Who knows what other emergency with unrealistic deadline will happen next Friday, but that too will likely wait until Monday to get looked at. Take care of Number 1 first.

South Korean researchers published a non peer reviewed article regarding a room temp (actually 127°C) ambient pressure superconductor. To make it better, it is also claimed to be very easy to produce in lab from mundane materials. Of course, if this is legit, it will be extremely interesting, bringing a fundamental change to quite a few fields (not power distribution, though, since it's a ceramic, so not suitable for making wires) That being said, there are a few red flags and indications that this may not be as initially presented. Buyer beware. https://qcentre.co.kr/lk-99

But some missions led by NASA (or even their solo endeavors) do include metal detectors. I honestly don't see why you find it unreasonable for some missions to omit this one particular test in favor of others. There are always cost, mass and energy budgets that need to be considered and of course some instruments get left behind so others can have their chance. Why this concern about heavy metals in particular? Sure, it would be nice to know the composition of soil on every landing site, but we already know the composition of lunar soil in general.

So they do participate in lunar landers having detectors for metals. Also worth mentioning that NASA already has 2000+ samples of actual lunar soil, totaling almost 400 kilograms from six different sites.

AM would scale exceptionally well, if you could magic away all the containment issues. There is no lower limit on the amount of antimatter that can annihilate.

While I hate to presume what somebody else meant, I can safely point out that, up until this post, nobody (including you) mentioned anything about spaceships or propulsion. Fusion reactor designs we have today rely on having tiny amounts of fuel inside the reactor that undergo fussion, after which the next batch of fuel is pumped in. This happens very rapidly, but those are distinct events - pulses. It has nothing to do with orion.

You don't think annihilation is hot?

Is it even a testimony? I was under the impression that it's nothing more than "A guy I know told me that his buddy heard about about a guy that read a document."

Pfft, they don't even have FTL tech, they are barely scratching the quantum stuff. Darn it, they think fusion is the future of energy production. They'll never be an advanced civilization. Barely worth mentioning in the next millenial edition of Universal catalogue. -An alien star chart clerk after taking a look at the Earth, all the way from another galaxy

It's gonna take quite a few years and permanent residents before it becomes cheaper to produce metals on Moon than it is to ship them from Earth. In the meantime, there will be plenty of opportunities for someone to take a rover and hand pick more samples in a day than a lander ever could.

So you have 36 km/s of dv. Since "near Mercury" is not really exact, lets have them landed on the surface. They'll need about 20 km/s to reach Mars (using Hohmann). From the original 144, they still have 120+ km/s to run circles around your defenders (or use faster transfer, in which case you decide just how much they have left, or if you want their nav officer to fall asleep at the wheel and then just whisk by Mars without the ability to stop, ending up crashing into The Big Jup).

At work, one of the parts we produce is a tube of about 50 mm in diameter (and roughly as tall) with a wall thickness of about 2 mm almost, but not quite all the way around. There are a few protruding features, which means that have to make it from solid square stock. About 90% of the material is turned to chips. Sure this is an outlier and for a larger runs it might be cheaper to have a thick walled tube custom made, but for a run of a few hundred per year, we just stock up on chip bags.