Green lightning may be caused by positive charges, or by camera lens
Physicist offers possible explanations for stunning photograph
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/12/mr_green-lightning.jpg?fit=860%2C460&ssl=1)
GREEN FLASH A bolt of green lightning in this 2008 photo could have been caused by a collection of positive charges — or by an illusion from the camera’s lens.
UPI Photo/Landov