Out of the utter blackness stabbed a sudden point of blinding light. It crept up by slight degrees and spread sideways in a thin crescent blade, and within seconds two suns were visible, furnaces of light, searing the black edge of the horizon with white fire. Fierce shafts of colour streaked through the thin atmosphere beneath them. "The fire of dawn!" breathed Zaphod. "The twin suns of Soulianis and Rahm..." [...]
Apparently Magrathea is some kind of legend from way back which no one seriously believes in. Bit like Atlantis on Earth, except that the legend says the Magratheans used to manufacture planets. [...]
The planet in questionisin fact the legendary Magrathea.
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