Earth has been ... and advance through eras of time! Advertisement Help! Earth has been mostly destroyed by an asteroid. My name is H.E.R.A. Will you help me resurrect all of Earth's creatures?
ZME Science on MSN8d
Earth Might Have Had a Ring System Like Saturn Millions of Years AgoThe ring might have acted like a giant sunshade, causing a cooling effect that might have unleashed an ice age.
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