Aboard the New Horizons craft as it edges closer to Pluto than we've ever been before is carried the ashes of its discoverer. Astronomer Clyde Tombaugh was the man that discovered our celestial neighbor Pluto. Now - thanks to some thoughtful NASA engineers - Tombaugh's mortal remains will be the closest that have ever traveled to our most distant Solar System cousin. This week NASA spoke with Tombaugh's children. "My Dad always said if he ever had the chance," said Tombaugh's son "he’d love to visit the planets in the solar system and around other stars." Now he will.