By Jonathan Amos
All is on course for Wednesday’s ambitious attempt to put a probe on the surface of a comet.
Europe’s Rosetta spacecraft is currently making a long arc around 67P/Churyumov-Gerasimenko.
Shortly after 06:00 GMT, the orbiter will make a sharp turn towards the ice mountain, accelerate, and then eject the Philae robot towards its target.
Separation should occur at about 08:35 GMT. Touchdown is expected roughly seven hours later.
There are a series of major decision points in the run-up to the ejection – what the controllers back here on Earth call Go/No-go decisions.
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