How long does it take sound to circle earth?

What are some interesting facts and mysteries surrounding Saturn? What is the worth of a dollar bill silver certificate with a star in front of the serial number in poor conditon? how many suns can you fit in pollux? How long is a centicycle? What layer in the atmosphere has most meteoroids break up? How does the rain get back up into the sky? Are there pictures of Jerrie Lee Apollo ohno's mother? What are the three elements which are not solid liquid or gas and what state are they in? What is the composition the gas giants? What are the names of the American spacecraft? Is sunrise an adjective? What evidence shows that some craters were formed by meteors? When you see a coloured object what are you really seeing? Have manned space ships traveled further from earth than the moon? When is the moons birthday? How does heat affect space? What information from clemntine helped scientists measure the thickness of the moons? What process makes the sun's heat light? What kind of rays does the sun have? What position is mercury compared to the other planets?