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AdamMarblestone's profile
Adam Marblestone
Adam Marblestone
Adam Marblestone
@AdamMarblestone

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Adam Marblestone

@AdamMarblestone

Technologist, Scientist

adammarblestone.org
Joined February 2009

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    1. Luke Parrish‏ @lsparrish Jan 23
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      It seems like a cheap way to block sunlight might be an ESL1 cloud between Earth and the Sun. Lots of very small particles gives a lot of surface area per unit mass, but shadows shrink with distance. Need to do some math. 🤔

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    2. Luke Parrish‏ @lsparrish Jan 23
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      Earth-Sun Lagrange point 1 is 1.5 million kilometers from Earth. https://en.wikipedia.org/wiki/Lagrangian_point#L1_point … So if I'm using the right heuristic (1%), that tells me a shade needs to be 15,000 km wide to block the full solar disk.

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    3. Luke Parrish‏ @lsparrish Jan 23
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      Another thing to think about is that small particles of dust would be blown away by the solar wind. That might be an advantage -- deploy a cloud, see what it does, then if you don't like it, let it be blown away naturally. But you'd want a time scale of a few years, not minutes.

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      Adam Marblestone‏ @AdamMarblestone Jan 23
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      Replying to @lsparrish

      There is a decent literature on this — see space mirror section ofhttps://longitudinal.blog/co2-series-part-3-other-interventions/ …

      4:17 PM - 23 Jan 2020
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        2. Luke Parrish‏ @lsparrish Jan 23
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          Replying to @AdamMarblestone

          Interesting! Small-angle scattering seems like it could be very low mass indeed, as it minimizes the amount of light pressure by only diverting it by a small amount. Of course, by the time you are worrying about light pressure being too high, you are redirecting a LOT of energy.

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        3. Luke Parrish‏ @lsparrish Jan 23
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          Replying to @lsparrish @AdamMarblestone

          I think the shade ends up redirecting a lot of energy that wouldn't have hit the earth anyway. But there's no way to avoid that really, as the shade can't distinguish the exact angle of a beam from the sun.

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