10–15 km wide · All Facts

10–15 km wide
The asteroid that ended the non-avian dinosaurs ~66 million years ago was roughly 10–15 km wide and carved the Chicxulub crater.
SrcNature Communications / PMC

Next evidence →59 metric tonnesDreadnoughtus was estimated at about 59 metric tonnes (~65 short tons) when described — and the specimen may not have been fully grown.

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eutherian mammals and precocial birdsBone histology shows dinosaurs grew at accelerated rates versus living reptiles — large species reached rates comparable to eutherian mammals and precocial birds.
permineralization and mineral replacementMost dinosaur “bones” on display are fossils formed by permineralization and mineral replacement — original bone pores and tissue swapped or infilled by silica and other minerals.
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