Neil deGrasse Tyson embarks on an astral voyage to every corner of the universe with his extra-terrestrial guide, Merlin. Have you ever wondered... What would happen if the Earth stopped spinning? What would happen if you dug a hole through the Earth and jumped through it? What is the largest moon in our solar system? What would happen if you found a bathtub large enough and put Saturn into it? Merlin's tour of the universe answers all of the above and more...