How do scientists know that a meteorite killed the dinosaurs?
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https://www.science.org/doi/10.1126/sciadv.abe3647
There is a layer in the sediment dating back 66.05 million years. That layer is super rich in iridium. There are large dinosaur fossils below that layer, but none found above it.
An iridium layer found all over the planet from exactly the same time can only be caused by a few events. The most probable is an asteroid impact.
In the 1990s the Chicxulub crater was suspected as the impact site, and in 2021 it was confirmed as the source of the iridium layer that marks the end of the dinosaurs.
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