It was shut down two-and-a-half years ago to save energy on its epic 600 million mile voyage.
If systems reboot correctly at
Previous missions have smashed into comets, briefly analysing the icy rocks.
"This is the first spacecraft that flies beyond the orbit of Mars with solar panels."
The 2.5 mile wide comet has almost no gravity, so the probe will have to use harpoons and ice anchors to clamp on to the surface.
It will study the plume of gas and water vapour that will boil off and trail behind as Churyumov-Gerasimenko nears the sun.
It will also analyse the chemical signature of hydrogen on the comet. If it matches that found in water on Earth it will strongly suggest that comets smashing into the planet billions of years ago filled the oceans.
And they may also have brought some of the ingredients for life.
British scientists are involved in 10 of the 21 experiments on-board. Engineers at Astrium
"It's interesting enough ... to actually design, build and launch a spacecraft, but to then see it travel around the solar system for 10 years to get to where it is now is just something else," he said.
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