• merc@sh.itjust.works
    link
    fedilink
    English
    arrow-up
    3
    ·
    8 months ago

    To me, the physics of the situation makes this all the more impressive.

    Voyager has a 23 watt radio. That’s about 10x as much power as a cell phone’s radio, but it’s still small. Voyager is so far away it takes 22.5 hours for the signal to get to earth traveling at light speed. This is a radio beam, not a laser, but it’s extraordinarily tight beam for a radio, with the focus only 0.5 degrees wide, but that means it’s still 1000x wider than the earth when it arrives. It’s being received by some of the biggest antennas ever made, but they’re still only 70m wide, so each one only receives a tiny fraction of the power the power transmitted. So, they’re decoding a signal that’s 10^-18 watts.

    So, not only are you debugging a system created half a century ago without being able to see or touch it, you’re doing it with a 2-day delay to see what your changes do, and using the most absurdly powerful radios just to send signals.

    The computer side of things is also even more impressive than this makes it sound. A memory chip failed. On Earth, you’d probably try to figure that out by physically looking at the hardware, and then probing it with a multimeter or an oscilloscope or something. They couldn’t do that. They had to debug it by watching the program as it ran and as it tried to use this faulty memory chip and failed in interesting ways. They could interact with it, but only on a 2 day delay. They also had to know that any wrong move and the little control they had over it could fail and it would be fully dead.

    So, a malfunctioning computer that you can only interact with at 40 bits per second, that takes 2 full days between every send and receive, that has flaky hardware and was designed more than 50 years ago.

    • flerp@lemm.ee
      link
      fedilink
      English
      arrow-up
      3
      ·
      8 months ago

      And you explained all of that WITHOUT THE OBNOXIOUS GODDAMNS and FUCKIN SCIENCE AMIRITEs

    • graymess@lemmy.world
      link
      fedilink
      English
      arrow-up
      1
      ·
      8 months ago

      Is there a Voyager 1, uh…emulator or something? Like something NASA would use to test the new programming on before hitting send?

      • Landless2029@lemmy.world
        link
        fedilink
        English
        arrow-up
        1
        ·
        8 months ago

        Today you would have a physical duplicate of something in orbit to test code changes on before you push code to something in orbit.