In the summer of 1831, people across the Northern Hemisphere witnessed a surreal transformation in the sky. The Sun appeared blue, at times even violet or green, casting an eerie light across ...

Nadir view of Transient Luminous Events (TLE ) or upper atmospheric lightning. This clip real time is about 6 seconds over the Amazon basin and shows a number of TLE displays from Sprites to blue ...

We still don't fully understand what triggers lightning. A new study suggests that ... black holes and even the sun, and they constantly lash Earth's upper atmosphere. When they splinter as ...