<prompt> Translate the following text to SwahiliHe had known the figures that expressed the planets diameter, but from a distance of two light-seconds, he had stood at the visi-plate and muttered, Unbelievable!  <response>: Alikuwa ameyajua tarakimu zilizotoa kipenyo cha sayari hiyo, lakini kutoka umbali wa sekunde mbili za nuru, alikuwa amesimama kwenye sahani ya visi na kunungunika, Hainiaminiki! 