You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: AMERICAN LITERATURE 
Clue: Thomas Pynchon followed "V" with this novel about the V-2 rocket
gravity\'s rainbow

Category: SAME FIRST & LAST LETTER 
Clue: It's the last name of TV's SpongeBob
squarepants

Category: WAVES 
Clue: The man waving, seen here, was designed by this astronomer

carl sagan