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Artículos sobre Extinction

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Megalodon would have dwarfed today’s great white sharks. Christina Spence Morgan

Megalodon sharks ruled the oceans millions of years ago – new analyses of giant fossilized teeth are helping scientists unravel the mystery of their extinction

Megalodon, the world’s largest known shark species, swam the oceans long before humans existed. Its teeth are all that’s left, and they tell a story of an apex predator that vanished.
Dodos have been extinct for centuries, but it’s not a simple matter to definitively designate a species as extinct. (Shutterstock)

When is a species really extinct?

Species are declared extinct when there have been no verifiable sightings for 50 years. Declaring a species extinct has implications for conservation efforts and policies.
Gilbert’s potoroo, a marsupial that may be extinct in 20 years. Dick Walker/Gilbert’s Potoroo Action Group

We identified the 63 animals most likely to go extinct by 2041. We can’t give up on them yet

The hardest to save will be five reptiles, four birds, four frogs, two mammals and one fish, for which there are no recent confirmed records of their continued existence.
A giant asteroid struck Earth and wiped out the dinosaurs 65 million years ago. Mark Garlick/Science Photo Library via Getty Images

An asteroid impact could wipe out an entire city – a space security expert explains NASA’s plans to prevent a potential catastrophe

NASA has only mapped 40% of the potentially dangerous asteroids that could crash into Earth. New projects will boost that number, and upcoming missions will test tech that could prevent collisions.

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