Fear not, followers of the Antares. ABC has not canceled "Defying Gravity." Not yet, anyway. That news may not be as comforting as it was intended to be, though, as the summer science-fiction series has vanished from the ABC schedules after only eight episodes, leaving its viewers dangling by a thread at the prospect of discovering the truth about the Antares mission and the mysterious "Beta." Set in the near future, "Defying Gravity" is considered a "Grey's Anatomy" in space with complex character backstories and intermingled relationships thrown into a life-or-death scenario. And, since its premiere on ABC, the show...