The Tau Ceti System (タウ星系, Tau Seikei) is a solar system consisting of Tau Ceti and its planets. One of the planets inhabiting this system is Sea of the Morning Star.


Tau Ceti is a star in the constellation Cetus that is spectrally similar to the Sun, although it has only about 78% of the Sun's mass. At a distance of just under 12 light-years from the Solar System, it is a relatively nearby star.

Known planetsEdit

(in order of distance from Tau Ceti)

(after Shining Blue Star, order unknown)


  • The names used for the Star and the constellation in Japanese are a little different from the real Tau Ceti. Tau is rendered in Hiragana instead of Katakana, while Kujira (Whale) for Ceti is rendered in Kanji instead of Hiragana. Although it is still said to be in the Orion Arm.
  • The real Tau Ceti has recently been found to have five planets - one of which (the fourth) is within the habitable zone.
  • In Volume 7, the Silent Whisper started its FTL jump beyond the sixth planet's orbit - presumably this is where the gravitational pull of Tau Ceti is low enough to perform jumps.

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