The engine constantly throttles up and down, not only to counter the drag on the satellite from residual air molecules in near space but also to smooth the flight of the vehicle to minimise the noise in the gravity measurements.

BBC: Goce gravity mapper surfs atmosphere

But we think that runs counter to the whole spirit of openness that has made the Internet such a powerful engine for not only economic growth, but also for the generation of ideas and creativity.

WHITEHOUSE: Your Interview with the President