Node Preview Kansas scientists probe mysterious possible comet strikes on Earth By News Releases (University of Kansas) The research shows a potential signature of nitrate and ammonia that can be found in ice cores corresponding to suspected impacts. Although high nitrate levels previously have been tied to space impacts, scientists have never before seen atmospheric ammonia spikes as indicators of space impacts with our planet.
Node Preview Last visit home for ESA's comet chaser Rosetta By News Releases (European Space Agency) ESA's Rosetta comet chaser will swing by Earth on Nov. 13 to pick up orbital energy and begin the final leg of its 10-year journey to the outer Solar System. Several observations of the Earth-moon system are planned before the spacecraft heads out to study comet 67/P Churyumov-Gerasimenko.