How do scientists know that a meteorite killed the dinosaurs?
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“Know” is a strong word in science. We look at the evidence, form a hypothesis, and test it against the observations. We have a lot of evidence that a meteorite hit the Earth approximatley 65MYA and we also have a lot of evidence that the dinosaur fossils start disappearing rapidly around that same time. We don’t have video footage of the meteor impacting the planet and we don’t have precise census-data of dinosaurs, but we make the best with what we have.
https://en.wikipedia.org/wiki/Chicxulub_crater
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