地球曾经也有环？！【宇宙杂谈】
土星有环，天王星有环，木星和海王星也有自己的环，然而你可能不知道的是，在很久很久以前，我们的地球可能也有环！
[1] Andrew G. Tomkins , Erin L. Martin , Peter A. Cawood. Evidence suggesting that earth had a ring in the Ordovician. Earth and Planetary Science Letters. 646, 118991. (2024)
[2] Ekaterina V. KOROCHANTSEVA, Mario TRIELOFF et al. L-chondrite asteroid breakup tied to Ordovician meteorite shower by multiple isochron 40Ar-39 Ar dating. Meteoritics & Planetary Science. 42(1):113-130. (2007)
[3] Birger Schmitz et al. ,An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body.Sci. Adv.5,eaax4184(2019)
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