RT @esaoperations: Mars & #SidingSpring seen together just ~17hr before closest pass #MarsComet Credit S Ferguson blogs.esa.int/mex/2014/10/19… http://t.co/vT5L4YFYrr
RT @esaoperations: Mars & #SidingSpring seen together just ~17hr before closest pass #MarsComet Credit S Ferguson blogs.esa.int/mex/2014/10/19… http://t.co/vT5L4YFYrr