Before the historic comet landing, Philae faces many dangers

"Are we nearly there yet?" is a plaintive query that most parents learn to dread, especially if uttered while halted in a traffic jam in the baking hot sun. At least the Rosetta spacecraft has not had to deal with interplanetary traffic on its way to its destination of Comet 67P Churyumov-Gerasimenko. It is also well-protected against solar radiation. But the scientists working on the Philae lander might be forgiven for feeling as if their journey is never going to end, as Rosetta makes increasingly delicate manoeuvres towards its final orbit.

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