Slashdot Mirror


Thick Dust Alters NASA Mars Rover Plans

coondoggie writes "NASA's long-running Mars rover Opportunity is getting ready for the harsh Martian winter, but this year for the first time in its nearly eight-year history it needs a sunnier location to continue its work. NASA said the rover, which depends on solar power for energy, is sitting just south of Mars' equator and has worked through four Martian southern hemisphere winters. Being closer to the equator than its now defunct twin rover, Spirit, Opportunity has not needed to stay on a Sun-facing slope during previous winters but now its solar panels carry a thicker coating of Martian dust than before."

36 of 97 comments (clear)

  1. Windshield wipers by Caerdwyn · · Score: 4, Interesting

    Windshield wipers! My kingdom for windshield wipers!

    A good guess is that, going forward, all new Mars landers will have either a wiper system or the ability to compress Martian atmosphere and then go POOF on the solar panels. Yes, more weight, but when the payoff is potentially many more functional months of service, it'd be worth it.

    --
    Everybody gets what the majority deserves.
    1. Re:Windshield wipers by f97tosc · · Score: 4, Informative

      A good guess is that, going forward, all new Mars landers will have either a wiper system or the ability to compress Martian atmosphere ...

      The new rover Curiosity currently en route to Mars has nuclear power.

    2. Re:Windshield wipers by Caerdwyn · · Score: 5, Funny

      Then the windshield wipers should work really well.

      --
      Everybody gets what the majority deserves.
    3. Re:Windshield wipers by CanHasDIY · · Score: 4, Funny

      I would imagine someone at NASA thought of that, but since they lacked an engineering degree, they were swiftly beaten with cudgels...

      NASA Engineers: "There we go, fellas, the rover's done! Nothing to do now but stick it on a billion dollar rocket and send 'er off into space! Just have to hope it doesn't get too dusty too fast."

      NASA Janitor, passing by: "Uh... couldn't you just stick, I dunno, some windshield wipers or somethin' on it?"

      NASA Engineers: ...
      :O
      ...
      :|
      ...
      :O
      ...
      >:*
      ...
      *thump*

      --
      An enigma, wrapped in a riddle, shrouded in bacon and cheese
    4. Re:Windshield wipers by Chibi+Merrow · · Score: 5, Informative

      They thought of all these solutions, and in the end it just made more sense to make the solar panels larger than do anything complicated.

      Don't forget these rovers were designed for a 90 day mission.

      --
      Maxim: People cannot follow directions.
      Increases in truth directly with the length of time spent explaining them
    5. Re:Windshield wipers by KendyForTheState · · Score: 5, Funny

      Whoa! Nuclear powered windshield wipers! How cool is that?

      --
      ...I just came for the free beer.
    6. Re:Windshield wipers by Anonymous Coward · · Score: 3, Informative

      yeah, RTG:

      http://mars.jpl.nasa.gov/msl/mission/rover/energy/
      http://www.ne.doe.gov/pdfFiles/MMRTG_Jan2008.pdf

    7. Re:Windshield wipers by decep · · Score: 5, Funny

      One wonders why they did not just use the nuclear power for the rest of the rover.

    8. Re:Windshield wipers by suomynonAyletamitlU · · Score: 4, Funny

      OH NOES!!!! NUKES!!! Evil!!!

      It's okay. Mars is the definition of "Not In My Back Yard," so Earthlings are all for it. And if the little grey dudes wanted us to stick to solar, they should have just blown the dust off the previous rovers.

    9. Re:Windshield wipers by Kjella · · Score: 5, Insightful

      Many options were considered, none found effective and reliable against the fine, dry dust on Mars. In fact that was the whole reason the original mission was limited to three months, if they knew a good way to remove it they would have. Luckily winds clear the panels from time to time, the weather hasn't helped recently but it's still running after 8 years and tilting towards the sun is no big deal. Why would you bother to change a design that works so well? Maybe give it a slightly bigger solar panel so it has a bit better margins but overall there's no reason to change it. By the way, how many times do you think this exact suggestion has come up over the last 8 years?

      --
      Live today, because you never know what tomorrow brings
    10. Re:Windshield wipers by Anonymous Coward · · Score: 5, Funny

      Martians are green, you insensitive clod!

    11. Re:Windshield wipers by twotacocombo · · Score: 2

      If they had expected to run these units as long as they did, I'm sure they would have already put them on there. They only banked on ~90 days, so there was no perceived need for this kind of thing. Right now, they're running on extended bonus time.

    12. Re:Windshield wipers by agrif · · Score: 4, Informative

      I believe one of the major problems is that dust on Mars can become very, very fine. There's no rain to clear dust from the atmosphere, so the little grains just keep hitting things and breaking apart, over and over. Martian fines can get down near 1 micron; for comparison, your red blood cells are about 8 microns wide. This stuff gets on everything. It goes through everything.

    13. Re:Windshield wipers by wierd_w · · Score: 3, Interesting

      One would think it would be like removing the extremely fine dust from an LP.

      Back in the day, there was this thing called an "Ion Gun".
      (Example product)

      It basically compresses and slightly ionizes atmospheric gas, then directs it at the surface to be cleaned. The electrical charge in the gas causes the dust to be electrostatically repelled from the surface, and the forced air blows it off.

      Surely such a toy could be attached to one of the arms of future solar powered rovers for periodic cleaning purposes, and even possibly for electrochemical experiments?

    14. Re:Windshield wipers by camperdave · · Score: 4, Informative

      I mean the panels can be rotated already no? Otherwise you don't even need windshield wipers, just a brush going over the panel once every few weeks...

      No, the panels are fixed in position. They were folded during the flight and were spring loaded to unfold. Once deployed, they were locked into position. Also, since the rovers were only meant to last for 90 days, the extra complexity of a wiper or blower (or my favorite, a spool of cellophane, like an overhead projector) was deemed unnecessary.

      --
      When our name is on the back of your car, we're behind you all the way!
    15. Re:Windshield wipers by BeShaMo · · Score: 2

      That's convenient. If we find life there, then we can terminate it immediately with extreme prejudice.

    16. Re:Windshield wipers by Whiteox · · Score: 2

      Nem fogom megvenni ezt a napelem, mert karcos.

      --
      Don't be apathetic. Procrastinate!
    17. Re:Windshield wipers by wierd_w · · Score: 2

      The ion gun cited charges one way, then the other to neutralize the surface. Ionic charge only persists a second or two.

      Eg, it fires negative ions as the trigger is pulled, then releases positive ions as the trigger is released.

      Persistent charge on an LP also promotes rapid resoiling, which is why commerical cleaning guns like this neutralize the charge after blowing the dust off.

    18. Re:Windshield wipers by vegiVamp · · Score: 2

      There is no such thing as criminally overdesigned. The only type of design that is downright criminal is planned obsolesence.

      --
      What a depressingly stupid machine.
    19. Re:Windshield wipers by tepples · · Score: 2

      Haven't you seen Apollo 18?

      No, I was waiting for 14 through 17 so that I wouldn't have to worry about big late arrival spoilers in 18.

    20. Re:Windshield wipers by drwho · · Score: 2

      Yes, I am in agreement. People at NASA are not, on the whole, stupid, though unfortunately NASA can be made to look stupid because of the political and economic conditions it has to work under. Often people point out the oft-repeated fable about NASA spending millions of dollars to develop a space pen whereas the Soviets just used pencils. It's a lot more complicated than that, see Snopes http://www.snopes.com/business/genius/spacepen.asp for an explanation. Too often slashdotters, and Americans in general, scoff at professionals and give undue credit to 'common sense'. Replies to this article, regarding windshield-wipers, are a good example. But luckily there are some replies to the replies which are intelligent.

      That being said, I would assume that they'd use an RTG (radioisotope thermal generator) if the projected lifetime of the rest of the mars rover called for it. Of course, maybe they were restrained by the anti-nuke sentiment which has infected so much of our culture.

      In any case, the Mas rover has been extraordinarily successful. Now, I wish we could do as well with Venus.

  2. Get Jony Ive on it! by Anonymous Coward · · Score: 2, Funny

    If only the rovers had a smart cover, they could turn on and as you open it and it cleans the solar panels from finger prints every time! Martian finger prints in this case.

  3. Paging K'Breel!!! by sconeu · · Score: 2

    Our gelsacs hunger for the words of the mighty K'Breel on the battle against the invaders from the blue world.

    --
    General Relativity: Space-time tells matter where to go; Matter tells space-time what shape to be.
  4. ugg splogs by Anonymous Coward · · Score: 5, Insightful

    why are we reading stories about Nasa on some shitty "network" splog laden with adverts ?

    we should be reading about this on Nasa's site the internet was supposed to cut out the middleman instead its full of shitty sites who do nothing but take without giving anything back.

    news for nerds ? news for desperate blog owners

    1. Re:ugg splogs by Frosty+Piss · · Score: 2

      And for pointing out the truth that we could be reading about this story from the source - NASA - instead of a site you correctly characterize as a money-grubbing, ad-laden blog filled with 3rd hand information, you get modded "troll" in typical Slashdot style.

      Bravo.

      --
      If you want news from today, you have to come back tomorrow.
  5. Dust Devils by PIPBoy3000 · · Score: 5, Informative

    It's my understanding that dust devils have done a pretty good job of keeping the solar panels clean over the years.

    1. Re:Dust Devils by Tablizer · · Score: 2

      Their timing is not very reliable, however.

  6. Well, if we had a manned Mars mission . . . by PolygamousRanchKid+ · · Score: 2

    . . . we could send someone up to dust them off, right?

    "Check your oil for you, sir? That left front tire could use a bit of air . . . "

    Now I remember why we used to call them "service stations" instead of "gas stations" . . .

    --
    Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    1. Re:Well, if we had a manned Mars mission . . . by ae1294 · · Score: 3, Funny

      . . . we could send someone up to dust them off, right?

      "Check your oil for you, sir? That left front tire could use a bit of air . . . "

      Now I remember why we used to call them "service stations" instead of "gas stations" . . .

      Really? I figured they once had hookers or something...

    2. Re:Well, if we had a manned Mars mission . . . by gstoddart · · Score: 2

      You're thinking of truck stops. ;-)

      --
      Lost at C:>. Found at C.
  7. Re:If only it could take a bath by Tablizer · · Score: 5, Funny

    Like a "meteor shower"? Ouch!

  8. What if: by Anonymous Coward · · Score: 2, Interesting

    What if the martian winds were to un-bury spirit's wheels and make it mobile? Would it start sending data back to earth? Has it ever stopped sending data?
    It would be super cool if they were able to get it working again with a little help from the martian environment.

    1. Re:What if: by Squidlips · · Score: 2

      It was not able to run its heaters so critical components (batteries?) were destroyed by the cold. So even if the wheels were uncovered and the remaining dust was removed its solar panels, it would not be functional. Remember that it went through the summer on Mars and got a good dose of solar energy, but it did not even have enough functionality to send out a ack signal on its low-gain antenna, never mind swivel its high-gain antenna. It is totally kaput, alas, but it went way beyond its expected lifetime (realistically its expected lifetime was about a year) and roved for about 6 years. Not only that but it landed in a bad spot (a "basalt prison" at Gusev crater), and was able to claw its way up a local hill and find the long-sought carbonate deposits in addition to other water-borne deposits such as silica.

  9. Better Late-Breaking News Than Never! by Tackhead · · Score: 5, Funny
    K'Breel, Speaker for the Council, was on his way from a late (as opposed to late-breaking) Council Meeting to his domicile, where he intended to consume nutrients. While exiting the Council Hall, an enthusiastic Citizen beseeched him thus:

    Our gelsacs hunger for the words of the mighty K'Breel on the battle against the invaders from the blue world.

    Always willing to place the needs of his Citizens before his own, the Speaker replied: "What more needs be said? One invader lies immobile and frozen in the plains. A second lies buried in a slowly-accumulating layer of carbox at the northern pole, a third never left the blue world's gravity well and spirals ever inward to a fiery doom (our analysts suggest a 75% probability of any surviving parts being condemned to dissolve in the toxic blue soup!), and although a fourth may have recently escaped the blue world's gravity well, it is destined to spend the next season squarely in the crosshairs of our Orbital Defense Forces, and yet you still require a progress report against this - this last struggling holdout?"

    "Let me reassure you personally, dear Citizen: as surely as dust continues to be distributed over the invader's solar panels, the Council sees no crisis, and barely an Opportunity. But even the dimmest of opportunities is worth seizing!"

    ~``~ideo~`ransmission fr`m news ~eport~~`~`hecksum mismatc~~``~~``

    Having delayed a hungry Speaker from his return home after a Council meeting, it is reported that the equally hungry gelsacs of enthusiastic citizen #64226 were seized, freeze-dried, ground into powder, and then tossed into the winds as part of the DDoS (Distributed Dusting of Solarpanels) attack still being conducted by our brave forces against the remaining invader at Devaur's End.

    "A shining example to all who live on our fair world, this enthusiastic Citizen took advantage of a rare Opportunity to take the battle directly to the enemy, and he shall be remembered fondly! EVER ONWARD TO VICTORY!" (Oh, and thank you for the excuse, Citizen. Don't worry too much. Sometimes they grow back!)

  10. Spirit is dead.. by Anonymous Coward · · Score: 2, Informative

    yes, Spirit is not sending data. It either got too cold, or something, but it's gone silent. The folks at JPL spent several months trying to contact it, but no joy.

  11. This is only part of the story by Squidlips · · Score: 2

    The real story is WHERE Opportunity will be wintering. It has found a nice cozy place with some very interesting rock outcrops. Clay? Sulfates? Who knows but the pictures look very interesting. Another dust issue is that the Min-TES has been disabled by dust. Opportunity could really, really use Mini-TES now in it current location. Another dust issue is what MSL will be doing, if anything, about dust on its instruments.