ScienceNASA satellite focused on global warming, CO2 levels NASA prepares to launch its Orbiting Carbon Observatory, again. The $468 million mission seeks to help scientists learn more about carbon dioxide emissions and climate change, so they can provide lawmakers with even more evidence on the issue.by Quinten Plummer
ScienceMysterious X-ray signal 240 million light years away may indicate dark matter presenceby Tina Shah