Which Outcome has a Launch Date of march 18, 1964; 14:50 gmt?
CREATE TABLE "spaceflight_by_year" (
  "rocket_launch" text,
  "launch_date" text,
  "mission" text,
  "institutional_authority" text,
  "launch_site" text,
  "outcomes" text,
  "derivatives" text
);
SELECT "outcomes" FROM "spaceflight_by_year" WHERE "launch_date"='march 18, 1964; 14:50 gmt';