The asteriod which completely wiped out the dinosaur

The cataclysmic extinction of that time was not caused by massive volcanic activity, as another theory has suggested, according to the new analysis, published today in the journal Science.
A panel of 41 experts from Europe, the U.S., Mexico, Canada and Japan analyzed new data from ocean drilling and continental sites and reviewed the research of palaeontologists, geochemists, climate modelers, geophysicists and sedimentologists who have been collecting evidence over the last 20 years to determine the cause of the Cretaceous-Tertiary (KT) extinction, which happened around 65 mi"They find that alternative hypotheses are inadequate to explain the abrupt mass extinction and that the impact hypothesis has grown stronger than ever," the University of Texas at Austin said in a news statement.
"Today's review of the evidence shows that the extinction was caused by a massive asteroid slamming into Earth at Chicxulub in MexicSome scientists have suggested that the Chicxulub impact happened 300,000 years before the KT boundary, and therefore came too early to have been the major cause of extinctions, the University of Texas said.
The KT boundary, also known as the Cretaceous-Paleogene (K-Pg) boundary, is how geologists refer to the time of the great extinction. Life on Earth after the event that caused the extinction was dramatically different to what was on the planet before.o," said Imperial College London, in a separate statement.
Scientists from both institutions participated in the study.
The KT extinction wiped out more than half of all species on the planet, including thThe asteroid, which was around 15 kilometers [9 miles] wide, is believed to have hit Earth with a force one billion times more powerful than the atomic bomb at Hiroshima. It would have blasted material at high velocity into the atmosphere, triggering a chain of events that caused a global winter, wiping out much of life on Earth in a matter of days," Imperial College said.e dinosaurs, birdlike pterosaurs and large marine reptiles, clearing the way for mammals to become the dominant species on Earth, Imperial College added in its releasellion years ago.