Are we about to see a rare green comet light up the sky? An expert explains what to expect from Comet Nishimura

Along the marshy backroads of the mid-Atlantic, some 40,000 acres of dead trees spear the sky, an insidious symptom of climate change. Our latest news feature at Front Matter (the magazine of PNAS) explores efforts to map these ghost forests and what's at stake for coastal communities.

Strange Lights Recorded During Morocco’s Devastating Earthquake

Mysterious Lights Flashed in The Sky Before Morocco's Devastating Earthquake