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Arecibo

Discussion in 'Fred's House of Pancakes' started by tochatihu, Nov 9, 2020.

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  1. Rmay635703

    Rmay635703 Senior Member

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    #41 Rmay635703, Dec 2, 2020
  2. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    If you always do what you always did.......
     
    #42 ETC(SS), Dec 2, 2020
  3. ChapmanF

    ChapmanF Senior Member

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    I hadn't realized that it got original construction funding from DoD in connection with ballistic missile defense.

    If that source of money isn't there for a rebuild, I duná Žno, might need a bake sale.

    I guess we got along for quite a while with just one 300 meter dish for a planet. Now there's a 500 meter dish. Maybe that's enough?

    Next one on moon? Nice craters there.

    No atmosphere. How often does stuff hit the moon these days?
     
    #43 ChapmanF, Dec 2, 2020
  4. tochatihu

    tochatihu Senior Member

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    I'm sure the issue of salt corrosion is being investigated on cables and fittings. Personal experience with salt on the island, and sticking something up high is a great way to collect more.

    In any case, it could be built stronger if that path were chosen.
     
    #44 tochatihu, Dec 2, 2020
    jerrymildred likes this.
  5. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    Less often than stuff hits the earth, if one presumes that the atmosphere is a part of the "earth." ;)
    The atmosphere DOES kinda take care of the small bits though. :D

    The Moon would be a WAAAY better place to put the observatory, except for the "getting all of the stuff up there" part.....

    Holes would be super easy to patch, and there are fewer hurricanes.....
    Salt isn't as big a problem either.
     
    #45 ETC(SS), Dec 2, 2020
  6. tochatihu

    tochatihu Senior Member

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    #46 tochatihu, Dec 2, 2020
  7. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    Bob Heinlein was right......
     
    #47 ETC(SS), Dec 2, 2020
  8. tochatihu

    tochatihu Senior Member

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    Harsh.

    Dusty too - in a bad way.
     
    #48 tochatihu, Dec 2, 2020
  9. ChapmanF

    ChapmanF Senior Member

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    Had not seen this before.

     
    #49 ChapmanF, Dec 2, 2020
  10. fuzzy1

    fuzzy1 Senior Member

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    Little holes (depending on shortest wavelength being observed) don't need to be patched. Significantly larger ones, but taking out only a tiny fraction of the reflector area, may well not be worth patching, if the adjacent reflector surface is not distorted.
     
    #50 fuzzy1, Dec 2, 2020
  11. tochatihu

    tochatihu Senior Member

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    #51 tochatihu, Dec 2, 2020
  12. fuzzy1

    fuzzy1 Senior Member

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    For frequencies 30MHz and lower, which are problematic down here on earth due to our ionosphere, mentioned in the article, and from human-generated "pollution".

    This range does not overlap the spectrum observed by the Arecibo telescope, 300 MHz - 10 GHz, so wouldn't be any sort of replacement for it.
     
    #52 fuzzy1, Dec 2, 2020
  13. Trollbait

    Trollbait It's a D&D thing

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    Or lust reuse it in local construction.
     
    #53 Trollbait, Dec 2, 2020
  14. Mark57

    Mark57 2021 Tesla Model 3 LR AWD

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    #54 Mark57, Dec 3, 2020
  15. ChapmanF

    ChapmanF Senior Member

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    Link on NSF site:

    Arecibo News Media | National Science Foundation

    Needs script permissions granted to www.nsf.gov, script and frame permissions to players.brightcove.net, and XHR to edge.api.brightcove.com and some akamaihd.net and boltdns.net domains. Then there is even a link to download it. It's a simple 56 MB mp4 video, once you've waded through all that nonsense to get there.
     
    #55 ChapmanF, Dec 3, 2020
  16. t_newt

    t_newt Active Member

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    It is amazing that the drone captured a close up video of the cable right when it decided to snap. Then the drone operator was smart enough to pan over to capture the platform collapsing. I wonder if the cable was making a groaning 'I'm about to break' noise beforehand.
     
    #56 t_newt, Dec 4, 2020
  17. fuzzy1

    fuzzy1 Senior Member

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    Considering that they were doing hourly inspections by drone, I suspect it was emitting such signs for quite some time.
     
    #57 fuzzy1, Dec 4, 2020
  18. Mark57

    Mark57 2021 Tesla Model 3 LR AWD

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    Probably. I read they were seeing indications that the collapse was eminent.
     
    #58 Mark57, Dec 4, 2020
  19. tochatihu

    tochatihu Senior Member

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    Space radar as a means to detect and characterize asteroids etc. heading towards earth may be picked up as a task by US Space Force.

    There are several optical telescopes doing this, but they do not see everything.
     
    #59 tochatihu, Dec 6, 2020
  20. Rmay635703

    Rmay635703 Senior Member

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    If they were expecting this outcome they should have run in the big cranes and cable runners

    my guess is running new cable would have been cheaper than reconstruction

    they could have supported the middle platform via crane then relieved tension on the old cabling and reloomed at their leasure

    things like this are done relatively often in non-remote areas, gotta wonder...
     
    #60 Rmay635703, Dec 6, 2020
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