Mysterious Green Light Over Japan Not a Meteor, NASA Data Shows.

A strange green light seen over Japan was captured on video by astronomer Daichi Fujii, who later discovered that it was caused by the Ice, Cloud, and Land Elevation Satellite 2 (ICESat-2) passing overhead. ICESat-2 uses lasers to measure the thickness of sea ice, ice sheet elevation, and other topographical features. The satellite's lasers had never been caught on film before, but Fujii's cameras were in the perfect position to capture the green beam as it scattered off clouds. NASA satellite data helped to solve the mystery of the green light.