Best of Last Week: RoboFly, a nighttime photovoltaic cell, and how roses improve learning during sleep
It was a good week for space research as a team at the California Institute of Technology found evidence to support a theory that suggests Mars' thin carbon dioxide atmosphere is due to a long-term stable polar deposit of CO2 ice that controls global atmospheric pressure. Also, an international team of astrophysicists showed new evidence for "frame-dragging," in which the spin of a celestial body twists space-time. The researchers tracked the orbit of an exotic stellar pair for almost two decades. And a team at Washington University in St. Louis found evidence of presolar grains in a meteorite not expected to harbor them.