Different cities bid to hold each year's World SF Convention. There are 900 active SFWA members in 23 countries. All of them may participate in the three-part process of choosing the Nebula winner. First, members submit signed recommendations for other writers' works. These are published six times each year in SFWA's Nebula Awards Report .
All works receiving ten or more recommendations go on to the Preliminary Nebula Award Ballot.
Each SFWA member may vote for up to five works on the Preliminary Ballot. The five with the most votes go on to the Final Ballot. The Nebula Awards were established in 1965. The award trophy is a Lucite block with polished stone planets and a galaxy of glitter embedded in it. Past winners include Isaac Asimov's The Gods Themselves , Arthur C. Clarke's Rendezvous with Rama , Frank Herbert's Dune , and Ursula K. Le Guin's The Left Hand of Darkness .