© A. GliksonMarble Bar sediments, a microcrystalline silicone-rich chert.
Scientists have found evidence of a huge asteroid that struck the Earth early in its life with an impact larger than anything humans have experienced.Tiny glass beads called spherules, found in north-western Australia were formed from vaporised material from the asteroid impact, said Dr Andrew Glikson from The Australian National University (ANU).
"The impact would have triggered earthquakes orders of magnitude greater than terrestrial earthquakes, it would have caused huge tsunamis and would have made cliffs crumble," said Dr Glikson, from the ANU Planetary Institute.
"Material from the impact would have spread worldwide. These spherules were found in sea floor sediments that date from 3.46 billion years ago."
The asteroid is the second oldest known to have hit the Earth and one of the largest.
Dr Glikson said the asteroid would have been 20 to 30 kilometres across and would have created a crater hundreds of kilometres wide.
About 3.8 to 3.9 billion years ago the moon was struck by numerous asteroids, which formed the craters, called mare, that are still visible from Earth
"Exactly where this asteroid struck the earth remains a mystery," Dr Glikson said.
"Any craters from this time on Earth's surface have been obliterated by volcanic activity and tectonic movements."
Dr Glikson and Dr Arthur Hickman from Geological Survey of Western Australia found the glass beads in a drill core from Marble Bar, in north-western Australia, in some of the oldest known sediments on Earth.
The sediment layer, which was originally on the ocean floor, was preserved between two volcanic layers, which enabled very precise dating of its origin.
Dr Glikson has been searching for evidence of ancient impacts for more than 20 years and immediately suspected the glass beads originated from an asteroid strike.
Subsequent testing found the levels of elements such as platinum, nickel and chromium matched those in asteroids.
There may have been many more similar impacts, for which the evidence has not been found, said Dr Glikson.
"This is just the tip of the iceberg. We've only found evidence for 17 impacts older than 2.5 billion years, but there could have been hundreds"
"Asteroid strikes this big result in major tectonic shifts and extensive magma flows. They could have significantly affected the way the Earth evolved."
The research is published in the journal
Precambrian Research.Source: Australian National University
Comment: Our world has fallen victim to comets, fireballs, asteroids and meteorites on a continual basis for all of its existence.
For an in-depth look at how these extraterrestrial insults have affected our civilisations - ancient and not so ancient - head to our
Comets and Catastrophes section for a number of articles on the topic. You can also visit our Red Pill Press store to pick up a copy of Laura Knight-Jadczyk's book,
Comets and the Horns of Moses to get an understanding of how the evidence of these events gave birth to mythology and how certain schools of philosophical thought were either suppressed or promoted in order to cover up the truth of a
human cosmic connection in order for the psychopaths who rule our world to continue to do so without blowback from the masses.
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Here W Thornhill says charged bodies exchange charge in space.
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D Talbot says this huge meteor --biggest in 100 years--raises questions as to similarity with Tungusta. 1,000x bigger than first claimed. And it failed to create ANY IMPACT ON EARTH. Brighter than 10 suns? Claimed electrical discharge was the cause of the body disintegrating in air so the Earth has protection making the supposed defense by missiles unnecessary and claimed impact craters questionable.