Where did David the scientist move to in Friends?

What would happen if the moon got too close to the earth? What was th purpose of Apollo 15 mission? How dense is the sun? Is the sun always the highest in the sky at midday? What constellations border cassiopeia? Why would magnetic declaration be different for different locations on the earth? Is the sun a star in the Milky Way? Do stalactites grow toward the cave ceiling? When did NASA start? What is a hinky pinky for something you see that glows? What is the heaviest element that a star can produce through fusion before going supernova? How do you get out of gravity falls? How did the US respond to the USSR sending a man to space? When our view of an object is blocked by either another object or by the earth's shadow? What is the layer of the sun responsible for the production of the tremendous amount of energy? Is Apollo 11 true or false? How is eating on space different from eating on earth? What can a rocket carry? What is the importance of accurate observations? What is a space elevator and how does it work?