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Mars landing live.

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    #62
    JupiterKid
    Moderators, Social & Fun Moderators Posts: 12,571 Mod ✭✭✭✭JupiterKid


    Behold the first clear image of Elysium Planitia from the 8th successful landing on Mars...

    1543336607874-pia22575-1041.jpeg


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    #63
    animaal
    Closed Accounts Posts: 815 ✭✭✭animaal


    What's the sculpture of the Haunting Soldier doing there blocking the view?


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    #64
    blinding
    Banned (with Prison Access) Posts: 7,466 ✭✭✭blinding


    JupiterKid wrote: »
    Behold the first clear image of Elysium Planitia from the 8th successful landing on Mars...

    1543336607874-pia22575-1041.jpeg
    Are the Martians behind the Camera ? Saying Cheese .


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    #65
    ohnonotgmail
    Registered Users Posts: 40,148 ✭✭✭✭ohnonotgmail


    Is that a true colour pic or have the colours been played with?


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    #66
    animaal
    Closed Accounts Posts: 815 ✭✭✭animaal


    ohnonotgmail wrote: »
    Is that a true colour pic or have the colours been played with?

    The cameras used in these landers tend to be monochromatic, with filters applied to isolate light of a given wavelength. If we take a "red" picture, a "green" picture and a "blue" picture, we can combine them and produce a good approximation of what a human eye would see (the human eyes have cones sensitive to roughly those wavelengths).

    In reality, the filters available on a given lander tend to be specific to the science being done, rather than producing pretty pictures. So for example, the previous rovers had filters that kinda matched the human eye, but not exactly. I think this was part of the reason why "touching up" was common.

    With this Insight lander, the filter wavelengths are 500nm, 550nm and 600nm. So Blue and Green are well represented. However, the "red" filter is yellow rather than red. Post-processing can simply use the yellow component as if it was red, producing an image that looks well balanced. However, shades in the yellow-red part of the spectrum may not represent what a real person would see.

    I've always been interested in the "real" colour of the sky on Mars. It's usually shown as muddy-red. However, on Earth, the sky is blue due to diffraction of light, not green just because the ground is green. On Mars, dust in the air could redden the sky, but there have been colour images produced that appear to show a grey or even blue sky.

    TLDR: the filters on Insight are close enough to human eyesight that I doubt they needed manipulation. However, they're not a perfect match for human eyesight.

    Edit: Sorry, I see the cameras are actually "colour", using a Bayer matrix rather than separate filters. the principles are the same though


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    #67
    DanMurphy
    Registered Users Posts: 398 ✭✭DanMurphy


    Mars landscape always reminds me of the Leb.
    I expect to see a militia Half-Track to appear on the horizon !


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    #68
    Zubeneschamali
    Registered Users Posts: 16,686 ✭✭✭✭Zubeneschamali


    animaal wrote: »
    I've always been interested in the "real" colour of the sky on Mars. It's usually shown as muddy-red. However, on Earth, the sky is blue due to diffraction of light, not green just because the ground is green.

    There is much less atmosphere on Mars, so there is much less of the Rayleigh scattering which makes our sky blue (scattering by molecules). There is a lot of dust in the Martian atmosphere because it is so dry and gravity is lower, so there is more Mie scattering casued by particles much larger than molecules. So the sky on Mars really is a different colour.


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    #69
    Kivaro
    Closed Accounts Posts: 4,105 ✭✭✭Kivaro


    JupiterKid wrote: »
    Behold the first clear image of Elysium Planitia from the 8th successful landing on Mars...


    And not a damn cloud in sight.


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    #70
    Wibbs
    Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 60,073 Mod ✭✭✭✭Wibbs


    animaal wrote: »
    I've always been interested in the "real" colour of the sky on Mars. It's usually shown as muddy-red. However, on Earth, the sky is blue due to diffraction of light, not green just because the ground is green. On Mars, dust in the air could redden the sky, but there have been colour images produced that appear to show a grey or even blue sky.
    IIRC A dawns and sunsets on Mars are more blue. I'd reckon pale sandy red is the general colour though. One thing the cameras do is enhance the brightness of the place. To the Mark 1 Human Eyeball, light levels on Mars at noon would be closer to early dusk here on Earth. Mars averaging one and a half times the distance from the sun of Earth(its got an eccentric orbit too so that distance can be higher). There's a good bit of fall off in light levels. Solar panels are around half as efficient because of this.

    Temperature wise it's both colder and funny enough can be hotter than Earth. At closest approach to the sun in the Martian summer ground temps can hit 35+ degrees, though with an atmosphere barely worthy of the name that would be mostly radiated heat.

    And speaking of radiation... If you wanted to find a natural method to sterilise medical equipment, the surface of Mars would be a good bet. Radiation slams into the planet with little interruption from the atmosphere and the lack of magnetosphere. It's at about the same levels as the vacuum of the moon's surface. So while our imaginations and Hollywood and even pics from probes make Mars look nice, almost like a desert here at home, it's pretty much as inhospitable as the Moon.

    Rejoice in the awareness of feeling stupid, for that’s how you end up learning new things. If you’re not aware you’re stupid, you probably are.



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    #71
    animaal
    Closed Accounts Posts: 815 ✭✭✭animaal


    Zubeneschamali wrote: »
    There is much less atmosphere on Mars, so there is much less of the Rayleigh scattering which makes our sky blue (scattering by molecules). There is a lot of dust in the Martian atmosphere because it is so dry and gravity is lower, so there is more Mie scattering caused by particles much larger than molecules. So the sky on Mars really is a different colour.

    I spent a while some time ago with the raw data from the previous rovers. They have a little square "calibration target" that can be used to validate the colour balance and filter selection. Depending on the purpose of the images, the effect can be false-colour.

    What I saw for sessions where the calibration target was relatively neutral was a sky with changeable colour - often pink, but sometimes grey, or even blueish. Never as blue as on earth of course. Whether that's down to the filters being not-quite human, or unusually clear conditions, or something else, I'm not sure.

    We might not know for sure until somebody sets foot there.


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    #72
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,696 Mod ✭✭✭✭Capt'n Midnight


    animaal wrote: »
    on Earth, the sky is blue due to diffraction of light, not green just because the ground is green. On Mars, dust in the air could redden the sky, but there have been colour images produced that appear to show a grey or even blue sky.
    When the Viking landers first sent back pictures they dialled in a blue sky when processing the images because of the diffraction...

    ...until someone noticed that one of the wires on the spacecraft was the wrong colour :pac:


    Nowadays landers have little ceramic colour swatches to calibrate the cameras.


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    #73
    4068ac1elhodqr
    Closed Accounts Posts: 9,586 ✭✭✭4068ac1elhodqr


    The folks at Pantone are letting their reference colour quality slip, by sticking down any old deep red on their 'Mars Red':

    tZhAJtF.png

    Imagine it's much closer to Hex: 934838 or 147, 72, 56 rgb.


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    #74
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,696 Mod ✭✭✭✭Capt'n Midnight


    Wibbs wrote: »
    And speaking of radiation... If you wanted to find a natural method to sterilise medical equipment, the surface of Mars would be a good bet. Radiation slams into the planet with little interruption from the atmosphere and the lack of magnetosphere. It's at about the same levels as the vacuum of the moon's surface. So while our imaginations and Hollywood and even pics from probes make Mars look nice, almost like a desert here at home, it's pretty much as inhospitable as the Moon.
    Never mind the radiation , Irish people wouldn't last píssing time with the UV index so high.


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    #75
    JupiterKid
    Moderators, Social & Fun Moderators Posts: 12,571 Mod ✭✭✭✭JupiterKid


    Full colour panorama of the Insight Mars landing sire.

    Sol10_InSightPostcard.jpg


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    #76
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Looks like the camera moved a number of times while scanning that image, parts of the craft look out of place.


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    #77
    Raheem Euro
    Closed Accounts Posts: 327 ✭✭Raheem Euro


    Deleted User wrote: »
    Looks like the camera moved a number of times while scanning that image, parts of the craft look out of place.


    Something interfered with it. Or someone.


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    #78
    Tilikum17
    Registered Users Posts: 1,316 ✭✭✭Tilikum17


    Raheem Euro wrote: »
    Something interfered with it. Or someone.

    A transformer.


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    #79
    degsie
    Registered Users Posts: 8,729 ✭✭✭degsie


    Space?


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    #80
    degsie
    Registered Users Posts: 8,729 ✭✭✭degsie


    Deleted User wrote: »
    Looks like the camera moved a number of times while scanning that image, parts of the craft look out of place.

    You know how panorama shots are taken, right?


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    #81
    Junkyard Tom
    Registered Users Posts: 10,117 ✭✭✭✭Junkyard Tom


    We've plenty of deserts and stones here without having to go out to Mars to look at theirs.


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    #82
    JupiterKid
    Moderators, Social & Fun Moderators Posts: 12,571 Mod ✭✭✭✭JupiterKid


    The colour of the sky has long been an issue of contention in Mars exploration. Landers show it as a salmon pink/light russet brown.

    What we DO know is that it's not blue: The first Viking lander images in 1976 showed the Mars sky as a dark blue but that was later corrected.

    There's an excellent National Geographic article from 1973 based on the results of the Mariner 9 orbiter that illustrated the sky of Mars as a very dark blue.


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    #83
    Kivaro
    Closed Accounts Posts: 4,105 ✭✭✭Kivaro


    Tilikum17 wrote: »
    A transformer.

    Well you go away out of it.
    Everyone knows there's no electricity on Mars.


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    #84
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Kivaro wrote: »
    Well you go away out of it.
    Everyone knows there's no electricity on Mars.

    Just s very long extension lead.


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    #85
    Kivaro
    Closed Accounts Posts: 4,105 ✭✭✭Kivaro


    Deleted User wrote: »
    Just s very long extension lead.


    Thank Heavens that they can use sky hooks to get the extension lead safely down to Moneypoint.


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    #86
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,696 Mod ✭✭✭✭Capt'n Midnight


    Kivaro wrote: »
    Well you go away out of it.
    Everyone knows there's no electricity on Mars.
    Duh

    Bring your own , a bucketful should keep you going for a while.


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