Was weaker gravity responsible for large dinosaur size?

Was weaker gravity responsible for large dinosaur size?

How did the sauropods—the long-necked dinosaurs like Apatosaurus, Brachiosaurus, and Diplodocus that grew to be the largest land animals that ever lived—get so huge? The full answer to that question is complicated and interesting, involving a lot of science I don’t know. Come to think of it, the true answer involves a lot of physics I don’t know: calculating the compressive strength of bones, the fluid dynamics involved in getting blood from the heart up to the head, and so forth. So, I’ll leave unabashed sauropod snuggler Brian Switek to talk about the biological and reproductive aspects of the big dinosaurs, and address another hypothesis: that Earth’s gravity was noticeably weaker in the Mesozoic Era, the Age of Dinosaurs.   …more

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