The Silent Stars Go By
James White's own favourite James White novel. He got the catchy title from listening to 'O, Little Town of Bethlehem' at a carol concert* The parallel-universe Hibernian Empire has risen to supreme power, with the help of applied Old World technology (Hero's steam engine, etc.) and new World natural resources (Brendan the navigator pre-empted Columbus by some five hundred years). Now the starship Aisling Gheal and its crew extend Oirish manifest destiny to outer space. Healer Nolan, an unbeliever in the priest-kings of Gor - sorry, Hibernia - finds himself pitted against the ultra-conservative Monsignor O'Riordan. I lapped it up. Mind you, I also think that Darby O'Gill and the Little People is a piece of grim documentary realism.
Readers also enjoyed
James White
James White, 1928-1999, was the creator of the famed Sector General stories about a huge intergalactic, multi-species hospital. He was born in Belfast, Northern Ireland, and has lived there his entire life. White's writing is particularly noteworthy for endlessly inventive aliens and alien environments. He started writing science fiction in 1953, besides the Sector General stories and novels, perhaps his most famous works are the novel The Watch Below, and the Hugo nominated story "Custom Fitting." In addition to his professional work, James White was a mainstay of Irish Fandom for more than forty years, contributing distinguished and creative essays to fanzines like Slant and Hyphen.

