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Worldbuilding - Atomic Rockets

The planet is named Uller (it seems that when interstellar travel was developed, the names of Greek Gods had been used up, so those of Norse gods were used). It is the second planet of the star Beta Hydri, right angle 0:23, declension -77:32, G-0 (solar) type star, of approximately the same size as Sol; distance from Earth, 21 light years.