ScienceTT: Source of great dinosaur extinction was not an asteroid, but actually a comet

New research says that a comet was responsible for dinosaur die off, not an asteroid.

@CharlesJGantt
Published Fri, Mar 22 2013 1:30 PM CDT   |   Updated Tue, Nov 3 2020 12:24 PM CST

For the last 50 years or so, it has been widely accepted that an impact from an asteroid was the direct cause of the extinction of the dinosaurs, but it appears that that theory has now been turned upside down. A recent report that was given at the 44th Lunar and Planetary Science Conference suggests that it was not an asteroid that caused the demise of the dinosaurs, but was actually a comet.

ScienceTT: Source of great dinosaur extinction was not an asteroid, but actually a comet | TweakTown.com

This theory is based on the fact that 180km wide Chicxulub crater in Mexico is simply too large to have been caused by a meteor, which is supported by the lack of an abundance of iridium. An element which would have been kicked up in vast quantities if such a large asteroid were the source of the crater.

Dr. Jason Moore, of Dartmouth College said: "You'd need an asteroid of about 5km diameter to contribute that much iridium and osmium. But an asteroid that size would not make a 200km-diameter crater," He theorized that the crater was created by something moving much faster than an asteroid, something with less rock and more ice.

The only thing that could have caused such a crater could be a comet. "So we said: how do we get something that has enough energy to generate that size of crater, but has much less rocky material? That brings us to comets." Not everyone is on the same page though with some studies finding that up to as much as 70 percent of the craters material was scattered throughout the world, while other studies only estimate as little as 20 percent was globally distributed via the atmosphere.

NEWS SOURCE:bbc.co.uk

A web developer by day, Charles comes to TweakTown after a short break from the Tech Journalism world. Formerly the Editor in Chief at TheBestCaseScenario, he now writes Maker and DIY content. Charles is a self proclaimed Maker of Things and is a major supporter of the Maker movement. In his free time, Charles likes to build just about anything, with past projects ranging from custom PC cooling control systems to 3D printers. Other expensive addictions include Photography, Astronomy and Home Automation.

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