A meteor that exploded off the coast of Massachusetts set off a loud boom equivalent to 300 tons of TNT, NASA said.

Local authorities have not yet confirmed the cause of the sound, and it remains unclear whether it was linked to an industrial incident, military activity or another event.

Have you ever been drifting off to sleep when suddenly you hear what sounds like a gunshot, a door slamming, or an explosion inside your head? You jolt awake, heart pounding, sit upright in bed, but ...