✔ 最佳答案
That might depend on how close we are to where it hits. If we are in Australia and it hits is Sweden, we might not hear it. We would feel it as the earth would shake and we'd soon become aware of it because dust and debris thrown into the atmosphere would block sunlight, probably for years. Of course we'd only worry about that if we survived the impact, the shock wave, the heat of the impact, the earthquakes and the tsunami. The odds would not be in our favour.