Science on the surface of a comet Preparing to build ESA’s Jupiter mission Rosetta: preparing for perihelion Cutting through martian history Astronomers use cosmic gravity to create a ‘black-hole-scope’ Counting stars with Gaia Comet sinkholes generate jets Monster black hole wakes up after 26 years Exposed water ice detected on comet’s surface Rosetta mission extended Hot lava flows discovered on Venus Dissolving Titan Philae wake-up triggers intense planning Rosetta's lander Philae wakes up from hibernation Three candidates for ESA’s next medium-class science mission ESA and Chinese Academy of Sciences to study Smile as joint mission Ultraviolet study reveals surprises in comet coma Threading the Milky Way Impact crater or supervolcano caldera? Send your drawing into space with Cheops m.deoxy.org