198

From a NASA blog post made the day after contact was lost: The dust storm that is affecting Opportunity has greatly intensified. The atmospheric opacity (tau) over the rover has increased to a record 10.8 on Sol 5111 (June 10, 2018). Power levels on the rover have dropped to a record low of ~22 watt hours. As expected, Opportunity has tripped a low-...


91

Opportunity does not literally speak English, so no such message was expressed in those terms. However, Opportunity did communicate the information that it had a low battery and it was dark outside. The rover's flight software outputs a variety of data formats (summarized in this paper) ranging from "event reports" to telemetry to binary data produced by ...


42

Other answers give good technical answers to what the last message would actually have looked like, but I thought it worth tackling the angle of where the quote came from. Wikipedia cites an article on LAist a Los Angeles local news / blogging site, written by Jacob Margolis. In it he describes how he coined the phrase: "My battery is low and it's ...


28

I asked Peter Norvig, who was on the review board, and he gave me the following more nuanced answer (the question was asked in the context of type-safety in programming language choice): The problem involved reading data from a file and a miscommunication about what the numbers in the file were. I don't know of any language, no matter how type-strict, ...


24

I do not know if this video depicts a real incident, but it does show one type of disaster that can happen in a warehouse with overloaded shelves. I don't see any reason to believe it was faked. The Daily Mail says that the video was uploaded to youtube without any description of where it happened. They are asking the public if they know where the footage ...


24

The MCO MIB has determined that the root cause for the loss of the MCO spacecraft was the failure to use metric units in the coding of a ground software file, “Small Forces,” used in trajectory models. Specifically, thruster performance data in English units instead of metric units was used in the software application code titled SM_FORCES (small ...


20

Yes, but from a practical standpoint, don't expect much from them as you aren't going to be getting that much electricity from the antenna. First off, to address the basic claim that you can harvest electricity through the air and use it to do some sort of practical work. This is an emphatic yes as crystal radios are passive devices that are able to ...


19

You're not going to find studies that do something like compare the effectiveness of a rubber duck vs a stuffed parrot specifically for programmers working on debugging tasks, nor can we really measure the size of the effect, but your main question can be answered if we approach it at a slightly higher level: does talking through a problem aloud aid in ...


19

"Space" and "visible" are poorly defined, but the broad question has been widely addressed already. Can you see it from the Moon, with a naked eye? No: NASA "The only thing you can see from the Moon is a beautiful sphere, mostly white, some blue and patches of yellow, and every once in a while some green vegetation," said Alan Bean, Apollo 12 astronaut....


15

This Metro article cites a tweet by Keri Bean, an engineer who worked on the opportunity mission who had Oppy’s final measurement tattooed on her arm. This tattoo means more to me than just Oppy. Of course, the biggest significance is this is Oppy’s final measurement. I studied tau (atmospheric optical depth) as a student researcher. Don’t worry, I ...


14

I'll try my shot at giving a good referenced answer. The claim As evidenced in this clearer explanation of the claim, by efficiency it is meant that the heat of the candles is retained by the pots and released slowly. There is also a secondary claim that this makes the system efficient enough to heat an open space. There is no claim that the total energy ...


12

Claim Why does a turbo engine require a “cooling down” period? It doesn't. Assuming we're talking about the typical turbocharger fitted to many current models of fairly ordinary car. What manufacturers Say According to an "engineering-based company specialising in turbocharger and supercharger design, replacement turbochargers, and manufacturers of ...


11

Usage There are many uses of conveyor belts, the one relevant to this question is probably the types of long conveyor using in mining, rather than conveyors used for less abrasive loads such as manufactured goods. Belt Durability According to Bridgestone Life of a typical conveyor belt is dependent on top cover wear and cut damage Their diagram ...


10

I can not find a positive reference for this claim. But what I've found is the text of the famous roman architect Vitruvius who pities [1] that a certain law in Ephesus, holding architects responsible for their works, does not exist in roman law: [...] When an architect [in Ephesus] was entrusted with the execution of a public work, an estimate thereof ...


8

This survey by Simmons et al. of ~1500 university professors in America shows that religious belief is negatively correlated with the academic standing of the university, and that engineering professors have some of the lowest percentages of religious belief. The authors then give some numbers regarding their data: Psychology and biology have the ...


8

Environmental and cosmetic factors in hair loss and destruction Acquired hair loss may be a manifestation of various internal diseases, hormonal and nutritional conditions, systemic intoxications and genetic traits. However, exogenous exposures may be major contributors to hair thinning and decline of texture, color, luster, elasticity and manageability. ...


7

The original video and forum post does a much better job explaining what is going on and states that the four (4) tea light candles are being used to warm the smaller inner flower pot which has the top drain hole blocked off while the large outer flower pot is used to create a convection effect that draws air past the warm inner pot and out the top. The ...


7

TLDR: Yes, some turbochargers need time to decompress otherwise they could be damaged. Perhaps my answer only applies to old turbocharged vehicles. My experience has only been with an early 90s Nissan Exa and an early 00s Subaru WRX and both of those had a "turbo timer". With the timer the car would continue to run for about 1 minute after switching off the ...


7

Absolutely, and there are two sides to this which appear successful: Induction: Nokia are one of those manufacturing products in this space to wirelessly charge batteries in mobile devices, along with manufacturers of electric toothbrushes, shavers, computer mice etc: All you need to do with one of these is pop your device on top of the wireless charger ...


7

Given that it is possible that some building techniques were lost to history, we'll never been able to definitively answer this question, but we can take a look at what we are capable of building now to see how it stacks up. Taking a look at the wikipedia entry for tallest man made structures we can see that the tallest structure ever documented is the ...


6

"Next to impossible with the naked eye" Source:Space in Images DETAILS Title Great Wall of China Released 22/06/2018 11:00 am Copyright ESA Description ESA astronaut Alexander Gerst took this photo from the Cupola on the International Space Station on 19 June 2018. Gerst posted the image on social media with the comment: "I think I finally ...


6

It depends on exactly what the claim is, but it's certainly not the "longest bridge in the world". Wikipedia's list of longest bridges, lists Danyang–Kunshan Grand Bridge as the Guinness Records holder with total length of 164km. Guinness' Longest Road Bridge is Bang Na Expressway with length of 54km. The Sheikh Jaber Al-Ahmad Al-Sabah Causeway is "only" ...


6

In some cases (1, 2, 3) it's true for cars with diesel engines with diesel particulate filter (DPF). DPF has to be regenerated (cleaned) now and then: How do they work? Diesel Particulate filters (DPF) or 'traps' do just that, they catch bits of soot in the exhaust. As with any filter (think of the bag in your vacuum cleaner) they have to be ...


5

Foka answer is spot-on for diesel engines with DPF. The same reasoning, to a lesser degree, apply to gasoline engines too. You won't gain power or torque, not in a perceptible way. But driving a car in a "spirited" way make it run smoother. How, and how much this is relevant, depends on the age of the car. Of course, as Glen Jaron pointed out, the car ...


5

Maybe, it really depends upon the type of engine you are talking about. If you do some searching around, the usual reason cited for the break-in period, as summarized by Wikipedia is that modern engines are built with higher tolerances than previous years which eliminates the need for the break-in period. However, on smaller engines such as ones used for ...


5

Yes, it is more efficient than just tealights, though still a very small source of heat. You note that "all heaters are 100% efficient." This is partially true - all heaters convert virtually all input energy into heat, thus achieving near 100% efficiency. However, if that heat simply rises to the ceiling by convection it doesn't do much to warm the room ...


4

The 52.5 km tower is definitely impossible no matter what technology you have. The reasons are the same as discussed for the height of a mountain in this skeptics.se answer. Above a certain height, the stone under the crust under the tower just isn't strong enough to support it. The actual details vary, but according to that accepted answer it should be ...


4

The next 2 sentences in the Wiki article are Incorporating a half-twist, it had the advantage over conventional belts of a longer life because it could expose all of its surface area to wear and tear. Möbius strip belts are no longer manufactured because untwisted modern belts can be made more durable by constructing them from several layers of different ...


3

While possible, this proposal is only practical if there is a high efficiency coupling between the transmitter and receiver. Anything else would waste the vast majority of the broadcast energy. With ordinary broadcasts the coupling is extremely loose, and all you will receive is microwatts or less. That may be enough to drive a clock, but not much else. ...


3

Not currently Its domain (www.diebergkomter.nl) is currently for sale, a strong indication the initiative has run out of steam. But that doesn't mean it was never considered. Not officially It has never been an official proposal or even idea by the Dutch government. Creating a new province, Flevoland, out of an inland sea, was. Building the Delta works to ...


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