As director of the Hayden Planetarium Neil deGrasse Tyson has dedicated his life to exploring and explaining the mysteries of the universe. Every year, he receives thousands of letters - from students to prisoners, scientists to priests. Some seek advice, others yearn for inspiration; some are full of despair, others burst with wonder. But they are all searching for understanding, meaning and truth. His replies are by turns wise, funny, and mind-blowing. Join the galactic conversation on the biggest issues of the universe.