"The comet 67P/Churyumov-Gerasimenko, which the Rosetta spacecraft is now orbiting, is by all accounts a fascinating chunk of dust and ice. This week, scientists using the spacecraft's high-resolution camera presented some staggering images of the duck-shaped comet at a planetary science conference in Tucson, Arizona. They showed the first color images of the comet. They showed dust grains being ejected from the surface, arcs that could be traced back, presumably, to geysers of sublimating ice. And they showed brightness variations less than 10 centimeters apart--which could indicate that they have found sparkling bits of ice peeking through a black crust of dust. But Rosetta's operator, the European Space Agency (ESA), has released none of these images to the public. Nor have any of these images been presented in Darmstadt, Germany, where scientists at ESA's mission control are preparing to drop the Philae lander to the comet surface on Wednesday. Project scientist Matt Taylor was reduced to learning about the new results at the Arizona conference by thumbing through Twitter feeds on his phone."