a href="/myfiles/Images/2013/08/29/li03_big.jpg" title="Sandra Bullock and George Clooney in "Gravity." " Sandra Bullock and George Clooney in "Gravity." VENICE — Sandra Bullock and George Clooney kick off the 70th edition of the Venice Film Festival with "Gravity," a 3-D techno-drama set in outer space. Bullock and Clooney play astronauts adrift in space after debris from a destroyed space station takes out their shuttle in the Alfonso Cuaron film, which opens the festival out of competition on Thursday. The stars arrived by motorboat convoy Wednesday a day ahead of their red-carpet global premier. Twenty films are vying for the coveted Golden Lion at the world's oldest film festival, which closes Sept. 7. The jury is headed by Oscar-winning director Bernardo Bertolucci. Golden Lion contenders include Terry Gilliam's "The Zero Theorem," Peter Landesman's "Parkland" and Kelly Reichardt's "Night Moves." — SG
