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Credit: Ilse Plauchu-Frayn The ability to have access to the Internet or use a mobile phone anywhere in the world is taken more and more for granted, but the brightness of Internet and telecommunications satellites that enable global communications networks could pose problems for ground-based astronomy. University of Illinois Urbana-Champaign aerospace engineer Siegfried Eggl coordinated

A polar bear sleeps at the end of the night along the shoreline of the Hudson Bay near Churchill, Canada. Polar bears have long symbolized the dangers posed by climate change, as rising temperatures melt away the Arctic sea ice they depend upon for survival. But quantifying the impact of a single oil well or