These electric-blue night clouds are expanding around the globe, says NASA
December 5, 2016, 12:05 p.m. by Michael d'Estries
Beautiful phenomenon, relatively new to science, may be growing due to greenhouse gas emissions.
Bizarre clouds over Bermuda Triangle may finally solve longtime mystery
October 22, 2016, 1:11 p.m. by Bryan Nelson
Clouds with sharp hexagonal features can cause sudden microbursts with winds over 170 mph.