
It was her idea to give the solar system's ninth planet (or first "Trans-Neptunian object" if you're some kind of wacko liberal astronomer... just kidding :-) the name "Pluto". Nine years old at the time in 1930 and born Venetia Burney, she was already quite knowledgeable about astronomy and classical mythology when "Planet X" was discovered.
Click on the link above for the entire fascinating story of how one little girl's breakfast-time suggestion became enthusiastically embraced by not just the scientific community, but also by the entire world.