To Crush the Moon

Appendix A-3 Planet Envy

But hell, all of Sol’s gas giants were prettier than Barnard’s, except perhaps for Uranus. And Sorrow was no Earth, and Planet One was no Mercury, and Barnard’s two asteroid belts were paltry middens against the grandeur of Sol’s one. That was the problem with red dwarf star systems: they occupied only the top three rows of the periodic table. Chlorine was the heaviest of their common elements, leaving little room for exotic aero- and geochemistry. They were, in a word, boring.