Pluto flyby: Here at last after nine years
The New Horizons spacecraft, launched by Nasa in January 2006, is finally approaching Pluto.
This is the climax of a three billion mile (4.8 billion km) journey.
For BBC Newsnight, science correspondent Rebecca Morelle and filmmaker Stuart Denman made this report on the science and the drama of this historic voyage to the fringe of our Solar System.