• cynar@lemmy.world
      link
      fedilink
      English
      arrow-up
      62
      ·
      3 days ago

      The amusing thing is that the sun is actually quite a shit fusion reactor. It’s power per unit volume is tiny. It just makes it up in sheer volume. A solar level fusion reactor would be almost completely useless to us. Instead we need to go far beyond the sun’s output to just be viable.

      It’s like describing one of the mega mining dumper trucks as an “artificial mule”.

      • notsoshaihulud@lemmy.world
        link
        fedilink
        English
        arrow-up
        26
        ·
        3 days ago

        I think this energy density math really depends on whether only the core or the whole surface area is taken into consideration.

      • lurklurk@lemmy.world
        link
        fedilink
        English
        arrow-up
        8
        arrow-down
        3
        ·
        2 days ago

        Arguably, the nearby sun scale fusion reactor has been fairly useful for us. Nowadays we can convert its output directly into electricity using solar cells

        • cynar@lemmy.world
          link
          fedilink
          English
          arrow-up
          6
          ·
          2 days ago

          I never said it wasn’t useful, just a very low efficiency reactor. Then again, if it was better, it would burn out faster, which would be bad for life on earth.

            • cynar@lemmy.world
              link
              fedilink
              English
              arrow-up
              1
              ·
              2 days ago

              That’s part of the reason a moon base could be viable. The sun outputs a reasonable amount of helium 3, which is great for fusion reactions. Unfortunately it tends to sit at the top of our atmosphere and get blown away again. On the moon, it gets captured by the dust in collectable quantities.

    • yogurt@lemm.ee
      link
      fedilink
      English
      arrow-up
      25
      ·
      edit-2
      3 days ago

      They say “artificial sun” because that’s what it is though, there’s no fusion reactions here they’re just microwaving hydrogen to millions of degrees to study the kind of thing that would happen IF somebody runs a fusion reactor for 22 minutes.