487
FCC approves giant space mirror as astronomers warn of risks to the night sky (www.thebrighterside.news)
submitted 3 months ago by to c/technology@lemmy.world
122 comments fedilink hide all child comments
you are viewing a single comment's thread
view the rest of the comments
[+] -13 points 3 months ago (12 children)

It would be completely impossible for them to all focus on the same spot, they'd be distributed around the world.

Also, that's not been approved. This approval is for a single prototype.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 12 child comments
    •
  • [–] 23 points 3 months ago (3 children)

    The amount of light pollution we have from cities is already more than necessary given that it covers makes most stars impossible to see.

    I don't think a large quantity of small fake moons is gonna help with that.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 3 child comments
    •
  • [+] -11 points 3 months ago (2 children)

    Last time a proposal like this made the rounds on the Internet stirring up consternation, the proposal was to use space mirrors to replace the street lighting for the Chinese city of Chengdu. It would have had no net effect on light pollution and would have reduced electricity consumption to boot.

    Bear in mind, this mirror focuses its light on a specific 5km-diameter patch of land. It won't be visible elsewhere.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 10 points 3 months ago (1 child)

    The visibility doesn't consider the massive glow that would appear to anyone seeing them outside their intended area of use due to reflections off dust and particles in the atmosphere. Light pollution goes far outside the area where cities are for the same reason, and having these in low earth orbit as a replacement for streetlights or as a spotlight would both have that happening.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 1 child comment
    •
  • [–] -2 points 3 months ago

    That's part of why experiments like this are done. Reflect Orbital would prefer that the spot be kept as tight as possible, they ultimately need to test out the technology to refine it.

    Almost everyone in this thread seems to be jumping straight from "their first prototype was approved for testing" to "therefore every plan of theirs is about to be immediately implemented." And the dopamine that comes from the ensuing rage and fear is making it hard to accept otherwise, it'd kill the buzz.

  • permalink
  • fedilink
  • source
  • parent
  • [–] 1 point 3 months ago (7 children)

    I was not thinking about combining the beans, but about the surface that 50k of them would cover and the amount of additional light that would represent. I do hope it's just some vaporware.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 7 child comments
    •
  • [–] -3 points 3 months ago (6 children)

    Why would they spread the light evenly? They're planning on selling it. Someone would need to pay them to have a place illuminated, it's not going to be randomly beamed all over.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 6 child comments
    •
  • [–] 1 point 3 months ago (5 children)

    Again you're implying something I didn't mean, but the point is that having 50k times the equivalent of the moon light intensity is expected to have a bad impact on the environment.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 5 child comments
    •
  • [–] -3 points 3 months ago (4 children)

    I'm not seeing why. Do you have any links to sources about that? If they were to focus all 50,000 mirrors on one 5km patch of land simultaneously that'd be 5000 lux, which is less than 5% of the intensity of full sunlight at noon. It would be impossible to do this since the 50,000 mirrors would be spread around the Earth, and if you brought them all together into some kind of grand conjunction they'd only remain in position to do so for a few minutes.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 4 child comments
    •
  • [–] 2 points 3 months ago* (3 children)

    Do we need a paper to estimate that ecosystems that evolved with a night time with a moon (mostly partial, sometimes absent), are going to be disturbed by having 50k of them? Also it's the new product's responsibility to demonstrate its safety.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 3 child comments
    •
  • [–] -2 points 3 months ago (2 children)

    I think you're drastically misunderstanding how this proposed constellation would work. It's not putting 50,000 "moons" in the sky. You can only see the light from the mirror in that one specific 5km patch of land that it's being aimed at. The vast majority of the world - including all the "wilderness", because who would pay to point these things at random patches of undeveloped wilderness - will not receive extra light from these things.

    It's more like setting up floodlights at a construction site, or street lights in a city.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 1 point 3 months ago (1 child)

    Earth's circumference is 40 000 km, if you align 50k patches of 5 km width, it covers more than 6 times this circumference. Current human's light pollution is already a biodiversity issue. This would be massively worsening the situation for just one system.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 1 child comment
    •