Did two asteroids kill the dinosaurs?

A newly discovered undersea crater off the coast of West Africa is leading scientists to wonder whether the dinosaurs were wiped out by more than one asteroid 66 million years ago


AFRICA
Atlantic Ocean

GUINEA- BISSAU
GUINEA
100km 60 miles

Nadir Crater
Now buried in sediment 400m below seabed

ATLANTIC OCEAN


Both asteroids hit Earth 66 million years ago

Chicxulub Crater
Diameter: 180km

Nadir Crater 
Diameter: 9km


Caused tsunami over 1km high
Fireball 
Water

Simulations suggest crater was created by collision of 400m-wide asteroid in 500-800m of water


Sources: BBC, New York Times, CNN, New Scientist, Science Advances 
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