In the canon of Heinlein’s works, ‘juvenile’ actually translates as mature and substantial. His ‘adult’ works on the other hand, generally appear to have been written by a sex-obsessed teenager (‘I Will Fear No Evil’) with a peculiar fascination for incest (‘Time Enough for Love’). So read his juveniles and skip his adult works. ‘Time for the Stars’ ranks among the best of his juveniles, with a notable lack of the usual garrulous father figure character, a fascinating dynamic between the identical-twin lead characters, and a notably deep exploration of the motives and reasons for long-distance exploration.