Athor derives Kalgash Two

After intense work, Athor formulates Postulate Eight: a non-luminous planetary body, which he calls Kalgash Two, is in a highly eccentric orbit around Kalgash. Its gravitational pull explains the orbital anomaly. The satellite is invisible due to its dark surface and the constant glare of the six suns. This discovery saves the Theory of Universal Gravitation but reveals a new, hidden component of the solar system.