According to NASA, an asteroid measuring about six feet across and weighing roughly six tonnes entered Earths atmosphere on March 17, travelling more than 34 miles through the upper atmosphere before disintegrating. Synopsis According to NASA, an asteroid measuring about six feet across and weighing roughly six tonnes entered Earth’s atmosphere on March 17, travelling more than 34 miles through the upper atmosphere before disintegrating. A dramatic fireball stre... [6124 chars]