Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old.

那个从一颗小行星残骸中采集的岩石样本的年代已达34.7亿年，其大小大约是导致恐龙灭绝的那颗直径为6颗核弹的小行星的两倍。