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At the end of The Three Body Problem, we discover that the Trisolarans are able to 2-dimensionalize a proton and make it into a computer called a sophon.

The 2-dimensional sophon stretches across the entire sky, wrapping the entire planet and shading it from the stars. From the description it seemed that its mirrored surface would be very protective from electromagnetic radiation. It is capable of becoming more or less transparent so they could tune it how they wished. EDIT: It seems I was wrong about the transparency. I couldn't find the source saying it could become more or less transparent. However, there is another potential solution by stretching it only so far when in 2D mode, and intelligently reflecting light when in a cold era or blocking it during a hot era. Though this would be much easier to explain why this would be difficult or impossible given the nature of the 3-body system since it would have to be more preemptive and the system cannot be predicted.

Once they had created this, couldn't they have just used this sophon to protect them from the harsh environments during Chaotic eras? This seems like it would have solved their survivability problems much more effectively than interaction with the humans.

Note: I have only begun book two so maybe this is addressed later.

  • I can't find any text saying it can become more or less transparent while unfurled. Which section of the book is that in? – Jontia Mar 9 '18 at 8:05
  • @Jontia you seem to be right, I must have misunderstood. When I went back through I couldn't find mention of transparency. I updated my question but it's less problematic now. – DLeh Mar 10 '18 at 4:06
  • The answer to questions involving world-spanning computers is usually 42. – Spencer Nov 20 at 19:37
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I don't think we get the sense that the trisolarans, in their advanced state of technology, are terribly bothered by the chaotic and stable eras anymore. At least, we don't get much information about it. However, we do know that they know their planet will inevitably, at an unknown point, fall into one of their stars. This is the real driver, I gather, of their frantic search to find a better planet to make their home.

BTW, asking a question on the internet like this before finishing the series is a risky move. I almost mentioned something from the third book.

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The Trisolarans' sophons were, as you may recall, able to be shattered by particle collisions in particle accelerators (albeit they were also able to reasseble themselves). Given that particles carrying much more energy than those in our most powerful accelerators (i.e. cosmic rays) are constantly bombarding our upper atmosphere and planet—and the same would be true for their planet—a long-term sophon shield seems a non-starter.

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