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The asteroid's impact was so huge that the blast led to the extermination of three quarters of all life on Earth, including most of the dinosaurs.
Professor Joanna Morgan of Imperial College London has co-led a major new study with Sean Gullick, professor of geophysics at the University of Texas, Austin into the the impact of this earth-changing asteroid.
Experts suspect that the dinosaurs were wiped out after a city-sized asteroid smashed into the Gulf of Mexico causing a huge crater. In a world first, evolutionary biologist Ben Garrod joins a multi-million pound drilling expedition into the exact spot the asteroid hit to get hard evidence of the link.
The team overcomes huge obstacles as it attempts to drill 1,500 metres beneath sea level to pull up rock from the Chicxulub crater.
This blocked out the sun and cooled the planet dramatically – below freezing for a decade – wiping out most life.
Those dinosaurs not killed by fumes, molten rock falling from the sky or tsunamis would have starved as their food ran out.
But this dark day for the dinosaurs provided an opportunity for mammals and ultimately humans to evolve.