Just our Solar System, the little corner of the Milky Way in which we live, is vast.Venetia Burney, the 11-year-old girl who in 1930 suggested the name "Pluto" for the newly discovered "planet", remembered playing games in Oxford's University Parks that would try to convey this scale.She and her school chums would hang a two-foot-wide orb on the gates to represent the Sun, and then space out a caraway seed for Mercury and peas to signify Venus and the Earth.Neptune was a lump of clay and sited a mile and a quarter from the gates."And then we were told the nearest star would be in China, and that really stuck with me," she recalled in a BBC interview.Before she died in 2009, Venetia got to see the launch of Nasa's New Horizons probe to Pluto. It's even got an instrument on it that is named after her.New Horizons was the fastest spacecraft ever despatched from Earth.