the lander has detached as we speak, it is in three full on the way to the comet. will it land safely? >> cheers erupting in the control room after flawless separation from the space craft. the first ever attempt to land on the surface after comet. a computer glitch briefly cutting communication threatening the mission. it is now on schedule to touch down on the comet in a few hours' time. the purpose, to learn more about the solar system formed over 4 billion years ago, the lander will gather gases, chemicals, and other properties from the comet. the rosetta space craft has been chasing the kplet for ten years millions of miles from earth. the trickiest part, well, how do you get the lander to land with little gravity? without full knowledge of what the inhospitable surfaces will be like and no control over where the spacecraft makes contact with the ground. if it goes according to plan the landing will look something like this. a daring feat revealing more secrets of the solar system, it could even explain the origin of life on earth. and we are hearing that the