Volcanic lightning is one of nature's most spectacular sights and now researchers are discovering more about why it happens.

Volcanic lightning looks surreal: an arc of light rises from the volcanic crater, stretching out into the murky skies. Although scientists knew what caused such frightening yet beautiful phenomena, ...

Physicists have solved a longstanding mystery around the process that creates volcanic lightning: when similar particles rub together, why do some become positively charged while others become ...