Plot: With the exciting news that the Philae lander had woken up on comet 67P, Sky at Night reveals the latest results from the Rosetta comet landing. What have they learnt so far from Philae's onboard instruments? What do the stunning images from Rosetta tell us about the formation and structure of comets? And project scientist Matt Taylor shows how Rosetta is measuring the growing tail of the comet as it hurtles towards the sun