Ten years ago and the launch of a breathtakingly ambitious mission - when the Rosetta spacecraft set off for a rendezvous and landing on the distant comet 67P/Churyumov-Gerasimenko.

Rosetta is now 800 million kilometres away. And because there’s not enough sunlight to power all but the essentials in deep space, it has been in temporary hibernation since 2011.  But at 10 am, on January 20th, an internal alarm clock will wake up Rosetta.