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  1. #3101
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    Quote Originally Posted by misskit View Post
    Seeing that, we know it was a close call!
    They selected a hazardous area because that is where the science is they want to do. But they knew the lander can select a safe area.

  2. #3102
    Thailand Expat OhOh's Avatar
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    Quote Originally Posted by Takeovers View Post
    They did not know where exactly in that area they would come down but wherever, they needed to land on an area marked blue and they did.
    Which direction was the lander travelling from. There does appear to be wider blue areas to land in, at the top, the left and the bottom of the coloured map.

    Unless the spot they chose had more certainty of finding what they were looking for. Any indication of fuel restrictions or any other reasons?

    Quote Originally Posted by Takeovers View Post
    that is where the science is they want to do.
    Weren't all the blue areas equally suitable?
    A tray full of GOLD is not worth a moment in time.

  3. #3103
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    They have a landing ellipse in the range of 5km. They have no influence on where in that ellipse they come down, it is determined by the inprecise parachute phase. They have a small maneuvering capability in the final approach with engines to avoid hazardous areas.

  4. #3104
    Thailand Expat OhOh's Avatar
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    ^ Thank you.

  5. #3105
    Thailand Expat OhOh's Avatar
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    Quote Originally Posted by Takeovers View Post
    how deep any water ice is buried under ground.
    Presumably they will aim to land near the spot where the buried ice is closest to the surface. If in fact they can choose the landing spot!

  6. #3106
    Thailand Expat harrybarracuda's Avatar
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    Quote Originally Posted by tomcat View Post
    ...these same people should pay attention (if they haven't already) to certain SF writers: enclose an expandable area of the Martian surface under a bubble of some hardy transparent material and build down using substances available on Mars itself...these can be duplicated as needed and connected either on the surface or through underground tunnels. No need to create an atmosphere outside that might dissipate or prove too expensive to maintain...eventually, what will be needed is a technological "explosion" that will inevitably occur after contact with an alien species (Three-Body Problem: Vol. 2)...
    I'm sure these same people are considering the problem from all angles.

  7. #3107
    Thailand Expat harrybarracuda's Avatar
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    Quote Originally Posted by OhOh View Post
    Presumably they will aim to land near the spot where the buried ice is closest to the surface. If in fact they can choose the landing spot!
    They had some technologies this time that weren't available before. It wasn't quite as hit and hope as you might think. Here's a really good animation showing how it all worked.





    There was doubtless a decent dose of relief mixed in with the excitement, for success today was far from guaranteed. Over the decades, only about half of Mars surface missions have touched down safely. And Perseverance's landing site on Jezero's floor, which features hazards such as cliffs, sand dunes and boulder fields, was the toughest ever targeted by a Mars mission, NASA officials have said.
    Indeed, this dangerous terrain required Perseverance to make the most precise Red Planet touchdown ever. The rover's landing ellipse was just 4.8 miles long by 4.1 miles wide (7.7 by 6.6 kilometers), compared to 4 miles by 12 miles (7 by 12 km) for Curiosity.
    Perseverance hit that target today with the aid of two new entry, descent and landing (EDL) technologies that Curiosity didn't have at its disposal. One, called "range trigger," allowed the mission to deploy its supersonic parachute at just the right moment. The other, "terrain-relative navigation," enabled Perseverance's sky crane to assess the Jezero landscape and navigate autonomously around potential hazards during the descent.
    These landing technologies worked exactly as planned, guiding Perseverance to a picture-perfect touchdown on a safe, flat part of Jezero's floor, mission team members said during a post-landing news conference this afternoon.
    Touchdown! NASA's Perseverance rover lands on Mars to begin hunt for signs of ancient life | Space

  8. #3108
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    A high resolution map of the area with the landing ellipse marked. It is pretty much a circle and the landing site is very close to the center. Need to get to that site and you can zoom in and out. From fu-berlin.de. Freie Universität Berlin.

    Jezero Crater
    "don't attribute to malice what can be adequately explained by incompetence"

  9. #3109
    Thailand Expat OhOh's Avatar
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    Quote Originally Posted by Takeovers View Post
    with the landing ellipse marked
    Your excellent lined map makes the landing site choice more understandable. Thanks

    Also a scale at the bottom left, A 50 km dia. patch to aim for, along with the height contours.

  10. #3110
    Thailand Expat harrybarracuda's Avatar
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    There is an excellent doco on Nat Geo called Built for Mars: The Perseverance Rover.

    Basically they've sent the most complex piece of engineering ever launched into space 200 million kilometres away to look for evidence of pond scum.


  11. #3111
    Thailand Expat harrybarracuda's Avatar
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    The helicopter is going to be a brilliant addition to the expedition.

  12. #3112
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    Quote Originally Posted by harrybarracuda View Post
    The helicopter is going to be a brilliant addition to the expedition.
    More like a drone, but yeah pretty cool. Been following that one too. Rover is pretty much the same as curiosity though, just the landing area is more risky.

  13. #3113
    Thailand Expat harrybarracuda's Avatar
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    Quote Originally Posted by Slick View Post
    More like a drone, but yeah pretty cool. Been following that one too. Rover is pretty much the same as curiosity though, just the landing area is more risky.
    It's the same basic design but there is a world of difference under the hood. Watch the documentary if you can find it, two hours of pure nerdery.


  14. #3114
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    Quote Originally Posted by harrybarracuda View Post
    There is an excellent doco on Nat Geo called Built for Mars: The Perseverance Rover.

    Basically they've sent the most complex piece of engineering ever launched into space 200 million kilometres away to look for evidence of pond scum.

    Quote Originally Posted by harrybarracuda View Post
    It's the same basic design but there is a world of difference under the hood. Watch the documentary if you can find it, two hours of pure nerdery.


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    Warning: Be cautious if you are a fragile pink

  15. #3115
    Thailand Expat harrybarracuda's Avatar
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    I don't see it listed on torrents. I found it on my IPTV catchup.

  16. #3116
    Thailand Expat OhOh's Avatar
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    Quote Originally Posted by harrybarracuda View Post
    Here's a really good animation showing how it all worked.
    The NASA touchdown video.

    ‘7 minutes of terror’: NASA reveals final nerve-shredding moments of rover’s descent to Mars (VIDEO)

    22 Feb, 2021 20:58

    ‘7 minutes of terror’: NASA reveals final nerve-shredding moments of rover’s descent to Mars (VIDEO) — RT World News

    https://twitter.com/hashtag/CountdownToMars?src=hashtag_click


    All under control from the calm female speaker.

  17. #3117
    Making people dance. :-)
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    Warning: Not Space News.


    But this is pretty interesting news, and also just pretty interesting, while also related to the possibility of life under the ice on geologically active moons Europa and Enceladus.


    Scientists stumble across life that ‘shouldn’t be there,’ 3,000 feet under Antarctica

    A team of British scientists were surprised to find life thousands of feet beneath the ice of Antarctica, in a sub-freezing environment where sunlight never reaches.




    there are “all sorts of reasons they shouldn’t be there.”
    A looming question is how the organisms are feeding, since researchers calculate that the closest source of photosynthesis is more than 900 miles away.



    Includes a good short video, presented by possibly the gayest man alive, of the discovery and the complexity of the life down there.

    Scientists stumble across life that ‘shouldn’t be there,’ 3,000 feet under Antarctica | WGN-TV

  18. #3118
    Thailand Expat harrybarracuda's Avatar
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    Quote Originally Posted by Edmond View Post
    Includes a good short video, presented by possibly the gayest man alive
    Skidmark got a job?

  19. #3119
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    Quote Originally Posted by Edmond View Post
    ince researchers calculate that the closest source of photosynthesis
    it's been long established that photosynthesis is not the only manner in which life forms supply their energy needs.

  20. #3120
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    Quote Originally Posted by TheRealKW View Post
    it's been long established that photosynthesis is not the only manner in which life forms supply their energy needs.
    Doesn't appear to be hydrothermal vents within the vicinity.

  21. #3121
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    Video doing the rounds this morning of the landing taken from the pod, the skycrane and the rover. awesome. Also audio of the Martian wind.
    on the phone so can't repost it.

    try here.

    Nasa releases video of Perseverance rover landing on Mars | Mars | The Guardian

    Ah ha

    Last edited by Cujo; 23-02-2021 at 12:43 PM.
    “If we stop testing right now we’d have very few cases, if any.” Donald J Trump.

  22. #3122
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    Quote Originally Posted by OhOh View Post
    ‘7 minutes of terror’: NASA reveals final nerve-shredding moments of rover’s descent to Mars (VIDEO)
    I watched the NASA press conference yesterday where they released that footage.



    Almost two hours, very long but interesting. A few facts. The cameras that took these videos are off the shelf equipment, only slightly modified for Mars conditions. Lots of the software is open source.

    I was quite surprised they got that much data in a short time. With Curiosity it took a long time for a lot less. All the Mars orbiters of the US and ESA were involved in transmitting. Especially the ESA Trace Gas orbiter.

    The landing video on YouTube


  23. #3123
    Thailand Expat OhOh's Avatar
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    Quote Originally Posted by Edmond View Post
    Not Space News.
    Very relevant to current searches for possible escape planets.

  24. #3124
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    Quote Originally Posted by Edmond View Post
    Doesn't appear to be hydrothermal vents within the vicinity.
    That covers extremophiles, but again human knowledge has advanced in that area. Scientists also know of halophiles, acidophiles and pyschrophiles.

  25. #3125
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    Quote Originally Posted by TheRealKW View Post
    That covers extremophiles, but again human knowledge has advanced in that area. Scientists also know of halophiles, acidophiles and pyschrophiles.
    Life requires energy. Light from the sun supplies energy. But bacteria can also metabolize chemical compounds. Bacteria have been found in rock km below the surface. Supply is very limited there so there are few. Black smokers provide plenty of energy so a lot of life there.

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