Kaneda 🏃♂️🌱🚴♂️🎮 🏳️🌈
Daniel PomarèdeCuriosity: 4844th day of the mission
Image captured 6 hours ago.
Credits: NASA/JPL-Caltech/MSSS
#Mars #Curiosity #rover #Sol4844 #CuriosityRover #space #science
Mx. Eddie R@pomarede
I feel ya, Curiosity.
I feel ya, Curiosity.
sigi714@silvermoon82 @pomarede Still functioning ;)
DoubleTreble 🥰🇵🇸🌍🇺🇦😺💚🧶🫖@pomarede
So we're already leaving debris on another planet, go us 🤬
So we're already leaving debris on another planet, go us 🤬
Aaron Sawdey, Ph.D.@DoubleTreble @pomarede Have you seen all the pictures of sky crane debris that Perseverance and Ingenuity have taken? There's bits of insulation from that thing that got blown all over.
Huubje@Huubje No, it’s a real thing. Here’s the post that reminded me:
CEDunn@DoubleTreble @acsawdey @pomarede I hope you achieve your goal of perishing from the universe leaving no trace
@cdunnpasadena @DoubleTreble @pomarede I’m all for leaving a trace, but maybe let’s be intentional about it instead of flicking our cigarette butts out the window (so to speak).
I don’t know, let’s build a Kepler Rosette or a Ringworld or something.
Spycrab@DoubleTreble @pomarede lol wut?!?!?!?
Z̈oé
Winchell Chung ⚛🚀Someone was a bit optimistic in their estimation of wheel durability
Galbinus Caeli
Michael Busch@GalbinusCaeli @nyrath @pomarede
Curiosity was designed to be able to drive even if the wheels are reduced to bare spokes, although not well: https://www.researchgate.net/profile/Wares-Chancharoen/publication/381094274_A_REVIEW_OF_STRUCTURAL_AND_SYSTEM_DESIGN_OF_MARS_ROVER_CURIOSITY_AND_PERSEVERANCE/links/665bf2aa0b0d2845747c008c/A-REVIEW-OF-STRUCTURAL-AND-SYSTEM-DESIGN-OF-MARS-ROVER-CURIOSITY-AND-PERSEVERANCE.pdf .
And the damage to Curiosity's wheels is why Perseverance's have significantly thicker tires.
Zdeněk Doležal
Ann EffesAh! I stand corrected.
It didn't occur to me that they would optimize to a specific number of years, instead of "infinity". Obvious in hindsight.
🇺🇦 haxadecimal 🚫👑@nyrath @Ann_Effes @pomarede
Very few engineered devices with either moving or electronic parts are actually engineered for more than a five year life. Some things are rated for ten year life, but that's actually rare. Things that last longer are due to having good margins, not due to a longer planned lifespan. Especially not for years with NO maintenance.
Very few engineered devices with either moving or electronic parts are actually engineered for more than a five year life. Some things are rated for ten year life, but that's actually rare. Things that last longer are due to having good margins, not due to a longer planned lifespan. Especially not for years with NO maintenance.
Nick@brouhaha @nyrath The latter is usually the case for things headed to space, especially if you can't practically switch over to a redundant spare. Since you went to all the money and effort to put it in space, you want to make sure it works for the intended mission life with high confidence, so you add a fair bit of margin, which means it has a good chance to last quite a bit longer than the intended mission life. But, as @Ann_Effes points out, there are costs to doing that, so you try not to go too overboard. @pomarede
hyratel@internic @brouhaha @nyrath @Ann_Effes @pomarede consider also that that wheel is disintegrating, but only from the main support ring inwards. The outer 1/3 looks still fairly intact and loadbearing. They'll have to be mindful of what they drive over, to avoid getting too much into "Air Sand" because the ground pressure on that wheel is going to go way up. but it can still ride over rocks just fine; the spokes and support ring should take care of that much.
@internic @brouhaha @nyrath @Ann_Effes @pomarede something that's noted in a lot of the literature around the wheels is an academically surprised tone over 'cracks seem to propagate from corner features of the grouser chevrons' which is .... Engineering 100: That's a stress concentration. Why are you surprised. (Percy's wheels have Wave grousers instead, and they're spaced closer together, so should hold up better)
Krzysztof Sakrejda
Will 
Paul HammondWounded, but still roving ☺️
an actual bus@pomarede my feet after a long-ass walk (it was worth it)
^[[200~Michael
Scale TheoryThis is the best of the best for the cost of this tire?
NASA, you're fired. WE were ripped off, but fleeced by the oligarchy with too much and gas people who don't need another "dollar" for the rest of their lives.
woe2you@SCALETHEORY @pomarede It was designed for 2 years, it's lasted 13. That's not bad.
Birds Books and Bullshit@SCALETHEORY @pomarede The mission was designed to last about 700 days, but is now on day ~5000. Undoubtedly the wheels were made as light as they thought they could get away with, because every ounce matters in a rocket launch. If you make something lighter to save weight, it will necessarily be less durable. According to other comments, NASA decided the durability of the wheels wasn't as high as they were hoping and future rovers got thicker wheels, necessarily at the cost of weight.
Building a rover is like building a race car: Spend a fortune on making everything as light as possible, and by “possible” I mean: light enough to last just long enough. If it lasts LONGER, it wasn’t lightweight enough. Because transporting mass to Mars is incredibly expensive, making things lighter is therefore the first step to saving money. And after all, the component has exceeded its planned service life by a factor of 7.
So indeed suboptimal: Still too sturdy.
Yeah yeah, got it, but this is still the best of the best? Wow, okay next excuse.
Seems a wheel from a lawnmower/shopping cart (made lighter with the most expensive metals/plastic) would last longer.
How about putting what was wasted in research for anti-magravity/ion/alternatives or just half/quarter/eighth of what CERN has spent.
Common sense, its societies new superpower. Rockets don't even make sense worried about weight.
"Seems a wheel from a lawnmower/shopping cart…"
Do you know how big Curiosity is? You may confuse that with earlier rovers, but Curiosity is as big as a smaller car.
You are suggesting putting shopping cart wheels to a VW Golf.
Also lawnmower/shopping car wheels are very primitive wheel constructions with no consideration of weight at all. It is quite easy to make something which is as sturdy but weights about 1/10th.
NASA would attempt at least 1/20th.
"(made lighter with the most expensive metals/plastic)"
Know what re-engineered is or an off the cuff reference is? Really like the twirly cart wheel, don't ya using it verbatim for size etc. Ignore the point though, love it.
2001 https://www.taxpayer.net/national-security/nasa-lost-in-space/
I have to admit - as I am not a native english speaker - I do not get your post(s).
I take them for face value.
With the last one I do not even get what the face value of the message would be though. 😜
To give you an idea of how well the shopping cart's wheels would fit, here is a photo of the rover in question: Curiosity is the big one on the right. Also note how wide the wheels are and and consider the potential benefits of very wide tires on sandy soil.
https://www.reddit.com/r/space/comments/7ryuxl/a_size_comparison_of_three_generations_of_mars/
"How about putting what was wasted in research for anti-magravity/ion/alternatives or just half/quarter/eighth of what CERN has spent."
So you want to divert money from research to send unnecessary stuff to Mars?
And you call that common sense?
Oookay.
@Ann_Effes
"So you want to divert money from research to send unnecessary stuff to Mars?"
Nope, money diverted to research that makes sense.
At what point do they give up on CERN, trillions, quad, a googolplex of cash? There is a better way to try, the sun doesn't do what they think if they can't copy the experiment.
CERN is financed with about 1 Billion swiss franks per Year.
And if I had to choose between CERN and bringing dead wight to mars - I would choose CERN any day.
(Reading your post, I get the impression that you think CERN is conducting research on nuclear fusion. But that’s not the case—or only to a very limited extent. I would agree that it is unnecessary to invest money in nuclear fusion research. We ALREADY HAVE solutions to that problem—and they're cheap, such as PV e.g.)
Know the benefits if we had some form of anti-gravity? Huge saving in so many fields of work. Money WELL SPENT, better than velcro or GPS from NASA.
Well… I don’t know.
Anything successfully shielded by a “gravity shield” would be accelerated upward with considerable force. Such an object or person would suddenly weigh less than the air around them and therefore rise up and "surface" (like a ping-pong ball underwater) until it or they reached the upper limit of the atmosphere—wherever that may be.
Once you activate your anti-grav-belt - you are dead.
(I do get that you where not dead serious here)
Cybarbie@Ann_Effes @SCALETHEORY @pomarede I think by now we have to realize that NASA scientists lie through their teeth about how long things are expected to last just so they extend the mission with "oh well it's there now it would be a real shame to waste it amazing its lasted this long... nooo us? would we do that? never!"
AccordionBruce@nf3xn @Ann_Effes @SCALETHEORY @pomarede
Never occurred to me those Voyager scientists were planing a generations–long job-retention plan for themselves
Never occurred to me those Voyager scientists were planing a generations–long job-retention plan for themselves
@AccordionBruce @Ann_Effes @SCALETHEORY @pomarede look how much _science_ we can fit in this >slaps roof<
@AccordionBruce @Ann_Effes @SCALETHEORY @pomarede on a more sad and serious note we are talking about turning off missions like Juno due to cuts when the pedo in chief is burning through the NASA budget in a couple of weeks with his reverse regime change.
I have to admit, I’m fascinated by the tendency to twist EVERY possible angle of a situation in such a way that something negative comes out of it.
The wheel is broken? I see, NASA messed it up.
Oh, the wheel lasted much longer than expected? I see, NASA intentionally ripped people off.
(Even if it is a joke - It was a joke, right?)
@Ann_Effes @SCALETHEORY @pomarede of course it is a joke - the engineering skill required by NASA to keep Voyagers alive is incomprehensible to all but a few thousand people on the planet of which thankfully I am one. I was an excited child when they were announced, were finally launched, have followed them since and thank goodness for the foresight of those engineers to be able to probe beyond our solar system. It was not their primary objective but not enough dollars in the world to buy that.
jimfl@Ann_Effes @SCALETHEORY @pomarede Building a bridge that doesn’t fall down is easy. Building a bridge that just barely doesn’t fall down is challenging
Mr. Lance E Sloan (IRL) 👤@pomarede
NASA didn't provide a pit crew‽
NASA didn't provide a pit crew‽
Gilberto Ficara@pomarede "ain't but a scratch" :)
ǝʌɐp
Urzl
Eye
Robin Barton@pomarede Where is Canadian Automobile Association when you need it?
A Republic, while we kept it@pomarede When 4800 sols old you reach, look as good you will not.
Tufty Indigo 🪗@pomarede They should have got Schwalbe Marathons, I'm pretty sure they'd still be going strong 😃
Kintarian
Howard Cohen@Kintarian @pomarede It's so far away.... It's gonna need AAAAAAAAAAAAAAAAAAAAA.
Danny Boling ☮️Science! 🤩