Venetia Burney Phair gave the planet Pluto its name in 1930 when she was 11.

In addition to the 13min documentary, the DVD includes interviews with Mrs. Phair and Sir Patrick Moore who describes the film as "historically well shot and produced."

DVD with extras (40mins) �9.99p from Father Films.

Mrs. Phair died on 30th April, aged 90. Her obituary appears in today's Times:

"My grandfather as usual opened the paper, The Times, and in it he read that a new planet had been discovered. He wondered what it should be called. We all wondered. And then I said, 'Why not call it Pluto?'."

The obituary continues:

Venetia's childhood reasoning was a mark of her sharp intelligence. Pluto was the Roman God of the underworld and a suitable name for the cold and distant trans-Neptunian planet.

Venetia's grandfather, Falconer Maden, retired head librarian of the Bodleian Library, Oxford, wrote to Herbert Hall Turner, Professor of Astronomy at Oxford, with her suggestion.

Professor Turner sent a telegram to the Lowell Observatory in Arizona:

"Naming new planet please consider Pluto suggested by small girl Venetia Burney for dark and gloomy planet. Turner."

Pluto was eventually favoured over several alternatives including Cronus, Minerva, Zeus, Atlas and Persephone......

Venetia received a �5 note from her grandfather, as a prize for her efforts, as did her school, the equivalent of �250 in today's money.