Legendary science fiction author Ray Bradbury died yesterday at age 91.   He's remembered best for short-story collections like "The Martian Chronicles," and novels like "Fahrenheit 451," "Something Wicked This Way Comes," and "Dandelion Wine."   In his lifetime, more than eight million copies of his books were sold in three dozen languages. Kim Stanley Robinson, science fiction writer known for his award-winning "Mars Trilogy,"  was born in Waukegan, Illinois, the same hometown of Ray Bradbury. He describes Bradbury's enduring influence.