# doppels *The Urth list — 1 messages, 1 voices, 03 Jul 1998* > Exported from an unofficial mirror of a public mailing list. Copyright > in each message remains with the person who wrote it. > Email addresses are obscured as `user at host`, the form the original > archive published. This file was rebuilt from parsed fields rather than > retained headers, so it is faithful in content but not byte-exact. --- ### Damien Broderick *03 Jul 1998, 14:36* mantis sez < There was a rash of "twin planet" stories in the seventies, wasn't there? 5HC, and then THE DISPOSSESSED, and who knows what else. Odd. > A recurrent trope in sf, neh? Recently re-read a quite impressive long novella by Blish, `Get out of my sky', from Astounding in 1956 (and in an antho with Poul Anderson's `Sister Planet' from 1959). Bob Forward's Rocheworld books (1982-1990), Bob Shaw's 1986-9 wooden spaceship trilogy (where pi = 3.000). Damien Broderick ---