... Collapse in Hebes Chasma on Mars . ... What's happened in Hebes Chasma on Mars? ... Rosetta Approaches Comet Churyumov Gerasimenko . ... Early this month humanity received a new rendition as the robotic Rosetta spacecraft went right up to -- and began orbiting -- the nucleus of Comet 67P/Churyumov-Gerasimenko. ... After 10 years and 6.5 billion kilometers of travel along gravity assist trajectories looping through interplanetary space, Rosetta had approached to within 285 kilometers of its target. ...