Eccentricity

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# Wiki Contributions

The planet Mercury is a pretty good source of material:

Mass:  kg (which is about 70% iron)

Volume:  m^3

Density:  kg/m^3

A spherical shell around the sun at roughly same radius as Mercury's orbit would have a surface area of  m^2, and spreading out Mercury's volume over this area gives a thickness of about 1.4 mm. This means Mercury alone provides ample material for collecting all of the Sun's energy via reflecting light – very thin spinning sheets could act as a swarm of orbiting reflectors that focus sunlight onto large power plants or mirrors that direct it to elsewhere in the solar system. Spinning sheets could be made somewhere between 1-100 μm thick, with thicker cables or supports for additional strength, perhaps 1-10 km wide, and navigate using radiation pressure (using cables that bend the sheet, perhaps). Something like  or  mirrors would be enough to intercept and redirect all of the sun's light.

The gravitational binding energy of Mercury is on the order of  J, or on the order of an hour of the Sun's output. This means in theory the time it takes for a new mirror to pay it's own manufacturing energy cost is in principle quite small; if each kg of material from Mercury is enough to make on the order of 1-100 square meters of mirror, then it will pay for itself in somewhere between minutes and hours (there are roughly 10,000 w/m^2 of solar energy at Mercury's orbit, and each kg of material on average requires on the order of  J to remove). Only 40-80 doublings are required to consume the whole planet depending on how thick the mirrors are and how much material is used to start the process. Even with many orders of magnitude of overhead to account for inefficiency and heat dissipation, I believe Mercury could be disassembled to cover the entire sun with reflectors on the order of years and perhaps as quickly as months; certainly within decades.

A better way to do the memory overwrite experiment is to prepare a list of what’s in the box to match each of ten possible numbers, then have someone provide a random number while your short term memory doesn’t work and see if you can successfully overwrite the memory that corresponds to that number (as measured by correctly guessing the number much later).

I’m confused. I know that it is like something to be me (this is in some sense the only thing I know for sure). It seems like there rules which shape the things I experience, and some of those rules can be studied (like the laws of physics). We are good enough at understanding some of these rules to predict certain systems with a high degree of accuracy, like how an asteroid will orbit a star or how electrons will be pushed through a wire by a particular voltage in a circuit. But I have no way to know or predict if it is like something to be a fish or GPT-4. I know that physical alterations to my brain seem to affect my experience, so it seems like there is a mapping from physical matter to experiences. I do not know precisely what this mapping is, and this indeed seems like a hard problem. In what sense do you disagree with my framing here?

Oh good catch, I missed that. Thanks!

The only metric natural selection is “optimizing” for is inclusive genetic fitness. It did not “try” to align humans with social status, and in many cases people care about social status to the detriment of their inclusive genetic fitness. This is a failure of alignment, not a success.