An official at the authority says that the fireball broke up at a speed above 120,000 km per hour NEW YORK, May 31. /TASS/. The fireball causing the loud boom in the State of Massachusetts in the United States broke up at a speed above 120,000 km per hour, a NASA official told TASS. "Current available information puts the fireball's speed at roughly 75,000 mph [120,700 km/h - TASS], and it appears to have fragmented at an altitude of 40 miles [64.3 km - TASS] above extreme northeast