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    CNN News:一颗流星在大气层爆炸 3个月后才被发现

    Source: 恒星英语学习网    2019-04-29   English BBS   Favorite  

    MICHAEL GARNETT: My entire apartment started shaking and there was a huge boom. I was just terrified. I had no idea what was happening.
    AZUZ: So if a meteor explodes in the atmosphere and no one's around to hear it, does it make a sound? NASA said it did. The fireball that blew up 16 miles over the earth's surface in December was the second most powerful one to enter our atmosphere in 30 years according to the space agency. So why wasn't this reported in December? Because scientists just noticed it. It was originally detected by military satellites and reported to NASA afterward. Why didn't pictures and video go viral on social media like those of other fireballs do?

    Because it happened over the Bering Sea in a pretty remote part of the world and relatively few people noticed. What exactly caused a blast that powerful? A meteor that scientists say was probably a few meters across. That's all it takes to release 173 kilotons of energy. And for reference one kiloton is equivalent to 1,000 pounds of TNT. Should you be worried about another one? Scientists say, no. Most fireball events are smaller. There have already been five note worthy explosions in 2019.

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