Press Esc to close
Sunday 24 July 2016
News updated at 8:07 AM IST
Weather
Max: 24.5°C
Min : 19.5°C
In Bengaluru
Generally cloudy

Comet, not asteroid, wiped out dinosaurs?

New York, Mar 24, 2013 (PTI)

A speeding comet, rather than an asteroid, slammed into the Earth 65 million years ago and sparked the extinction of the dinosaurs, scientists claim.

Many scientists believe the 180 km Chicxulub crater in Mexico was made by the impact that caused the extinction of dinosaurs and about 70 per cent of all species on Earth.

The crater was probably blasted out by a faster, smaller object than previously thought, according to the new study presented at the 44th Lunar and Planetary Science Conference in The Woodlands, Texas.

Evidence of the space rock's impact comes from a worldwide layer of sediments containing high levels of the element iridium, dubbed the Cretaceous-Paleogene (K-Pg) boundary, which could not have occurred on Earth naturally.

The new study suggests the often-cited iridium values are incorrect. Scientists compared these values with levels of osmium, another element delivered by the impact.

Their calculations suggest the space rock generated less debris than previously thought, implying the space rock was a smaller object, 'LiveScience' reported.

The researchers concluded in order for the smaller rock to have created the giant Chicxulub crater, it had to have been going exceedingly fast.

Their results indicate the impact is more compatible with a long-period comet, which can take hundreds, thousands or sometimes millions of years to orbit the Sun once.
It is possible that a rapidly moving asteroid could have caused the Chicxulub impact crater, but the fastest-moving objects that have been observed are mostly comets, researchers said.


Go to Top

Photo Gallery
Actress Aindritha Ray performing during Shatha Sambrama -University of Mysore Centenary...

Actress Aindritha Ray performing during Shatha Sambrama -University of Mysore Centenary...

School students sit in the formation of a plane as they pray for the Indian Air Force plane...

School students sit in the formation of a plane as they pray for the Indian Air Force plane...

Indian Army soldiers rescue flood affected villagers near India-Bhutan border of Chirang...

Indian Army soldiers rescue flood affected villagers near India-Bhutan border of Chirang...

Prime Minister Narendra Modi interacting with the children at the launch of the Reliance...

Prime Minister Narendra Modi interacting with the children at the launch of the Reliance...

Flamingos fly over Chandlai Lake in Jaipur on Saturday. Flamingos travel thousands of miles...

Flamingos fly over Chandlai Lake in Jaipur on Saturday. Flamingos travel thousands of miles...

Director Porsche India oavan Shetty with new Porsche 911 car during the launch in Bengaluru...

Director Porsche India oavan Shetty with new Porsche 911 car during the launch in Bengaluru...

Women on a boat wade through flooded area after heavy showers in Mayong village in Morigoan...

Women on a boat wade through flooded area after heavy showers in Mayong village in Morigoan...

Kite club India fly's 300 kite during Kite festival 2016 as the part of Income Declaration...

Kite club India fly's 300 kite during Kite festival 2016 as the part of Income Declaration...

Villagers along with their cattle wade through a Banana raft from the flood affected village...

Villagers along with their cattle wade through a Banana raft from the flood affected village...

A fan sports painting Rajinikanth's Kabali on his body at the release of his new film 'Kabali' ...

A fan sports painting Rajinikanth's Kabali on his body at the release of his new film 'Kabali' ...

Copyright 2014, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bengaluru - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523