Crown capital earth management fraud warriors : Were the dinosaurs killed by a comet? ホーム・ガーデニング

The extraterrestrial object that slammed into the Earth 65million years ago and sparked the extinction of the dinosaurs was most likely a speeding comet, new analysis claims.
New research has suggested that the 110 mile-wide Chicxulub crater in Yucatan, Mexico, was caused by the impact of a smaller object than previously thought.
But for a smaller object to have caused such a cataclysmic impact it must have been moving at speeds usually only reached by comets hurtling through our solar system from outer space.

Boom: A computer generated picture imagines how it might have looked when a suspected asteroid struck the Yucatan peninsula 65million years ago. New research suggests that the impact may have been a comet
It has hitherto been claimed that the the culprit was a large, relatively slow-moving asteroid, the disintegration of which left a global layer of sediments enriched in iridium.
But at the 44th Lunar and Planetary Science Conference in Woodlands, Texas, researchers from New Hampshire's Dartmouth College suggested that the amount of debris left by the collision indicates the object was much smaller.

Is that a wry smile on the sun's surface? Amateur astronomer captures solar streaks from a Wycombe back garden
Stunning space image captures spring arriving across the planet
Nasa images reveal final resting places of twin spacecraft which crashed onto surface of the moon
Their research suggests frequently cited figures overstate the amount of iridium left behind by the impact, BBC News reports.
Comparison with quantities of osmium left behind by the impact led them to deduce that the collision left less debris on Earth than has previously been supposed - suggesting a much smaller body was involved.
But for a smaller space rock to have produced a crater the size of Chicxulub, it must have been travelling at speeds more consistent with a comet careering through our solar system from outer space.

Cataclysmic: The impact would have caused some of the largest megatsunamis in Earth's history, as well as sending a cloud of super-heated ash and dust into the atmosphere
Dr Jason Moore, from Dartmouth College, told BBC News: '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.'
'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.'
Professor Mukul Sharma, also of Dartmouth College, added: 'You would need some special pleading for an asteroid moving very rapidly - although it is possible.
'But of the comets and asteroids we have looked at in the skies, the comets are the ones that are moving very rapidly.'

Crown capital
earth management
fraud warriors









▲ PageTop