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太阳系首个星际访客并不特殊 银河系或存在数万亿颗
source link: https://tech.sina.com.cn/d/s/2019-01-21/doc-ihrfqziz9580120.shtml
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来源：科技日报科技日报北京1月20日电（记者刘霞）据美国太空网日前报道，2017年，雪茄形状的“奥陌陌”闯入太阳系，成为科学家发现的首个星际访客，引发了不小的轰动。尽管它是小行星、彗星还是外星飞船还是个未知数，但美国科学家近日表示，类似“奥
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