tyson: her grandfather thought that was a splendid idea, so he wrote a note to the lowell observatory. the director at lowell liked it, especially because pluto's official symbol would be the overlapping letters p and l, the initials of the observatory's long-gone founder, the man who started the search for planet x, percival lowell. for most americans the name "pluto" didn't exactly conjure up affection. it was associated with a well-known laxative called "pluto water," a popular product that promised "relief from constipation in 30 minutes to two hours." its slogan: "when nature won't pluto will." but the name would soon get a makeover... and it would come from a young animator by the name of walt disney. shortly after planet pluto was discovered the fledgling disney brothers studio came up with a new character... (barking) a playful bloodhound named pluto the pup. walt probably wasn't thinking about constipation when he named mickey's new pal back in 1931. my journey would lead me south to a magical place to meet with a celebrity on a tight schedule. pluto! hey! it's great to see y