It has been suggested by Tsutomu Nihei himself in his artbook Blame! and So On that the scale of The City is beyond that of a Dyson sphere, reaching Jupiter's planetary orbit (32.675 AU, or roughly 4,901,250,000 km); this is also suggested in scenarios such as Blame! vol.
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More recently Dr Standish has collaborated with Dr. Elena V. Pitjeva and Dr. Agnes Fienga on the topic of a better determination of the Astronomical Unit and of the masses of the asteroids.
During observations by Instituto de Astrofísica de Canarias in Tenerife, Spain in 1998, a substellar-mass object was discovered to orbit approximately 300 astronomical units (AU) from the star.
Assuming a stellar luminosity of 0.042 percent that of Sun, the habitable zone where an Earth-like planet may retain liquid water at comfortable temperatures would be located within 0.02 Astronomical Units (roughly 10 times the distance of the Moon from Earth).