Space analysts, who have asked since January who President Bush would pick to head NASA, now wonder whether anyone wants the job. A new NASA chief would work for an administration that favors military uses of space and offers no prospects for an increased budget during the next four years. The White House is known to favor an administrator from the private sector, but salary could be a complication as the job pays markedly less than those held by aerospace industry executives. Most experts speculate the post is best suited to someone who has significant savings and political aspirations.