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The asteroid 2012 DA14 will miss Earth on Friday, but there's a long history of hits. 3 Minute Read. By Brett Line, National Geographic News. ... which mark the largest asteroid impacts. ...


Throughout recorded history, hundreds of Earth impacts (and exploding bolides) have been reported, with some occurrences causing deaths, injuries, property damage, or other significant localised consequences. One of the best-known recorded events in modern times was the Tunguska event, which occurred in Siberia, Russia, in 1908.


The impact believed to have killed the dinosaurs was the only known collision over the past half-billion years that made a spherule layer as deep as those of the Archean period. The relative abundance of the beds supports the hypothesis for many giant asteroid impacts during Earth's early history.


Biggest Asteroid Impacts In Earth's History. Time and again, asteroid impacts on Earth have scarred the surface of the blue planet, leaving behind massive craters. An Artist's Representation Of An Asteroid Belt In Orbit Around A Star.


IMPACTS. The Chicxulub crater on the north shore of the Yucatán Peninsula in Mexico is a 65-million-year-old asteroid or comet impact scar the source of which is thought to have brought about the end of the dinosaurs, along with about 70 percent of life on Earth. The recently discovered impact kicked up a global cloud of dust and sulfur gases ...


An ocean impact could cause enormous, destructive tsunamis. Courtesy NASA Asteroidal assassins People have been worrying about cosmic collisions for a long time, but the field only gained scientific legitimacy in the 1980s when the extinction of the dinosaurs was pinned on a single strike of a comet or asteroid.


Soot could be the main cause of mass extinction after an asteroid impact. The history of life on Earth could have varied, then, according to impact site, and depended on minute differences in the ...


Earth’s greatest hits: Six of the biggest meteorites in history. From the mysterious Tunguska event to the fossilised Morokweng space rock, when whopper meteorites come along they make a big impact


Historical Impacts. ... The shock and heat from the impact transformed graphite into diamonds throughout the impact area. ... The unmistakeable site of an ancient asteroid impact -- a 180km (100 miles) circular crater -- contains minerals that show the effects of high temperature and pressure, shock, and shattering.


The 25 Biggest Turning Points in Earth's History. Our planet has existed for 4.5 billion years, and it has been a busy few eons. Here are the 25 biggest milestones in Earth's history.