RT @AsteroidEnergy: RT @joelwmparker The weight of the 100kg #Philae lander on the surface of comet C-G will be less than a piece of paper on Earth. #Rosetta
RT @AsteroidEnergy: RT @joelwmparker The weight of the 100kg #Philae lander on the surface of comet C-G will be less than a piece of paper on Earth. #Rosetta