Press Esc to close
Wednesday 23 July 2014
News updated at 11:02 AM IST
Weather
Max: 28°C
Min : 21.3°C
In Bangalore
Sunny day

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
Telangana chief minister K.Chandrashekhar Rao presenting a letter of appointment...

Telangana chief minister K.Chandrashekhar Rao presenting a letter of appointment...

Sand artist Sudarsan Pattnaik created a sand sculpture on sexual assault of a 6 year old girl...

Sand artist Sudarsan Pattnaik created a sand sculpture on sexual assault of a 6 year old girl...

Prime Minister Narendra Modi receives Swami Vishvesha Tirtha of Pejawar Mutt, in New Delhi...

Prime Minister Narendra Modi receives Swami Vishvesha Tirtha of Pejawar Mutt, in New Delhi...

Mercedes Benz MD aand CEO Eberhard Kern at the launch of Mercedes CLA 45 AMG...

Mercedes Benz MD aand CEO Eberhard Kern at the launch of Mercedes CLA 45 AMG...

Children playing football in a waterlogged field after heavy rains at a village in Balurghat...

Children playing football in a waterlogged field after heavy rains at a village in Balurghat...

People enjoy a dip in temperatures at the Rajpath amid heavy shower in New Delhi...

People enjoy a dip in temperatures at the Rajpath amid heavy shower in New Delhi...

Abhishek Bachchan, owner of Pink Panther Kabaddi team, pose for a group photo...

Abhishek Bachchan, owner of Pink Panther Kabaddi team, pose for a group photo...

Women labourers cover themselves as rain showers lash at Ghatanji on the outskirts of Yavatmal...

Women labourers cover themselves as rain showers lash at Ghatanji on the outskirts of Yavatmal...

The Gaganachukki and Bharachukki Falls in full splendour following the of release of water...

The Gaganachukki and Bharachukki Falls in full splendour following the of release of water...

UNICEF Goodwill Ambassador, Roger Moore addressing at the UNICEF and Commonwealth Games...

UNICEF Goodwill Ambassador, Roger Moore addressing at the UNICEF and Commonwealth Games...

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