Philae is about the size of a washing machine.
It will use harpoons and screws to try to hold itself down
The date has been fixed for Europe's daring attempt to land on a comet: Wednesday 12 November.
It will see the
Rosetta satellite, which is currently orbiting the huge "ice mountain" known as 67P, drop a small robot from a height of 20km.
If all goes well, the lander will free-fall towards the
comet, making contact with the surface somewhere in a 1km-wide zone at
roughly 15:35 GMT.
The European Space Agency (Esa) says the challenges ahead are immense.
Imagine pushing a washing machine out the back of an airliner
at twice cruising altitude and expecting it to hit Regent's Park in
London - all while the ground is moving underneath.
Although not really analogous for many reasons, this scenario
does give a sense of the difficulties involved.
The chances of failure
are high.