Science: Off to the Highlands

Despite man's daring exploration of the lunar surface, the enigmatic moon still conceals the story of its origin and evolution. In fact, the findings of the Apollo astronauts have created new lunar mysteries. Says Apollo 16 Command Module Pilot Ken Mattingly: "The first four landing missions have really posed more questions about the moon than they've answered."

Some of the questions may be resolved by the flight of Apollo 16, scheduled to lift off from Cape Kennedy on Sunday, April 16. The spacecraft will carry Mattingly and his two crewmates, John Young and...