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posted by chromas on Friday October 19 2018, @01:28AM   Printer-friendly
from the Checkmate,-moon-believers! dept.

Who needs street lights? Chinese city plans fake moon

In Chengdu, there is reportedly an ambitious plan afoot for replacing the city's street lights: boosting the glow of the real moon with that of a more powerful fake one.

The capital of the southwestern Chinese province of Sichuan plans to launch an illumination satellite in 2020. According to an article in People's Daily, the artificial moon is "designed to complement the moon at night", though it would be eight times as bright. The "dusk-like glow" of the satellite would be able to light an area with a diameter of between 10 and 80km (six to 50 miles), while the precise illumination range could be controlled within tens of metres – enabling it to replace street lights.

The vision was shared by Wu Chunfeng, the chairman of the private space contractor Chengdu Aerospace Science and Technology Microelectronics System Research Institute Co (Casc), at a national mass innovation and entrepreneurship event held in Chengdu last week. Wu reportedly said testing had begun on the satellite years ago and the technology had now evolved enough to allow for launch in 2020. It is not clear whether the plan has the backing of the city of Chengdu or the Chinese government, though Casc is the main contractor for the Chinese space programme.

Also at The Guardian and Inverse.


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  • (Score: 3, Informative) by FatPhil on Friday October 19 2018, @03:35PM

    by FatPhil (863) <{pc-soylent} {at} {asdf.fi}> on Friday October 19 2018, @03:35PM (#750960) Homepage
    Does the inverse square law apply here? The inverse square law assumes that the "source" is throwing light over a fixed solid angle, such that the target takes up ever smaller proportions of that angle as the distance increases; but this is more a set of focused beams than it is just glowing and irradiating willy-nilly.

    Thought experiment, which sensor gets more light:

    candle
    ()                                     |
    ---barrier-------------------------    | perfect mirror
                              sensor  <    |

                     ()                    |
    -----------------------------------    |
                     <                     |

                                      ()   |
    -----------------------------------    |
    <                                      |

    Distance to mirror seems to be more or less irrelevant in this highly reflective case.
    --
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