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~ Mysterious ~
I guess it’s true that we don’t know exactly what kind of rock hit the planet and created 2 billion craters from ejecta.
On the other hand, that makes every impact on every planet ~ mysterious ~
clickbaity.
In true clickbait fashion the article then goes on to describe in detail said mysterious thing. Almost like it isn’t mysterious at all.
Real scientists would say two gigacraters.
