Traditionally, how many players are there on a baseball team?

9

What is the name of the three-headed dog guarding the gates of the Underworld? In what movie does Robin Williams deliver the inspiring line 'O Captain! My Captain!'? In golf, what term is used when a golfer scores one stroke below par for a hole? Where was the song "Silent Night" originally written and performed? Which superhero team did Kitty Pryde notably join in comics?