Comet Schwassmann–Wachmann

Green fireballs that streaked across the sky and rolled down an Australian mountainside four years ago, spurring reports of UFOs in the area, might have been meteors and ball lightning, a researcher suggests. At least three traffic-light green fireballs brighter than the moon but not as bright as the sun blazed over northeast Australia on May 16, 2006. A farmer saw one with a blue tapering tail…