SIZZLING SKIES

摘要

The meteorite, Keay calculated, had streaked across the sky at almost 20 kilometres per second, 30 kilometres up, yet he met dozens of reliable witnesses who claimed to have heard it produce strange noises as it flew overhead—anything from "a low moaning" to "an express train travelling at high speed". If these sounds had come directly from the meteorite, people on the ground below shouldn't have heard them until almost a minute after it exploded. It would be like seeing a distant flash of lightning and hearing the thunderclap at the same instant.