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... there are signs that a huge crater buried deep under the East Antarctic ice sheet was caused by the largest piece of space rock ever to hit the Earth. Magnetic imaging shows an impact area about 500 kilometres in diameter. That would indicate a meteor nearly 50 kilometres wide.
A rounded landform on the northwest shoulder of Mexico's Yucatan peninsula is all that can be seen of this giant impact site. Scientists speculate that a celestial object some 10 kilometres wide smacked into the area 65 million years ago. That's estimated to have caused an explosion equivalent to 100 trillion tonnes of TNT, or five billion times larger than the atomic bomb dropped on Hiroshima in August 1945.
Deep beneath the Canadian Shield, miners from this city toil to extract seams of nickel and copper exposed when a meteor the size of Mount Logan is thought to have slammed into Earth some 1.8 billion years ago.
Literally speaking, there was no physical impact here when a massive explosion in 1908 levelled trees, broke windows and caused casualties over a wide area of Central Russia. Eyewitnesses report seeing a brilliant blue light streak across the sky, followed by series of loud bangs.
Arizona meteor crater
A relatively small chunk of matter from space crashed into the Arizona desert between 20,000 and 50,000 years ago.
The crater is just over a kilometre from rim to rim, which indicates a space projectile about 40 metres in diameter.
100km (62mile) wide crater discovered in Greenland - and it is possible crater is more than 500km in size
Finnefjeld mountain, which is around 1050m high, is believed to be the crushed core of the structure
The dull grey rocks were crushed to fine powder by the impact, and then cut by white melt sheets
The method used to prevent a cataclysmic disaster will depend on how large the object in question is. ..., but there are still things that we can do:
Nuclear Bomb: to detonate a nuclear weapon, or some other powerful bomb strategically near the object. The blast would knock the object off course.
Rocket Motor: Alternatively, a rocket or motor could be attached to the object, and used to drive it onto a new course.
Solar Sail: The solar energy from the sun can actually apply pressure on an object. So a sail could be attached to the object to harness the solar wind, similar to how we use sail boats here on Earth, and divert the course of the object that way.
Break The Object Up: NASA could also use a weapon to break the object up into smaller pieces.
The problem is that these defenses are not in place, some of them only exist in theory.
2011 AG5 is the object which currently has the highest chance of impacting the Earth … in 2040. However, we have only observed it for about half an orbit,
DE-STAR is being described as a ‘directed energy orbital defense system,’ one that uses solar energy to feed its lasers. The researchers have calculated DE-STAR systems in various configurations, including a 100-meter DE-STAR 2 and a 10-kilometer DE-STAR 4, the latter capable of delivering the energy needed to obliterate a 500-meter asteroid in about a year.
A fascinating prospect, and more likely to receive funding now, after the russian
Larger still, DE-STAR 6 could enable interstellar travel by functioning as a massive, orbiting power source and propulsion system for spacecraft. It could propel a 10-ton spacecraft at near the speed of light, allowing interstellar exploration to become a reality without waiting for science fiction technology such as "warp drive" to come along, Lubin said.
The asteroid that hit Vredefort is estimated to have been one of the largest ever to strike Earth (at least since the Hadean eon some four billion years ago), thought to have been approximately 5–10 km (3.1–6.2 mi) in diameter.
At roughly 213-215 million years old, Manicouagan is one of the youngest large astroblemes visible on the surface.
Acraman crater is a deeply eroded impact crater in the Gawler Ranges of South Australia. Its location is marked by Lake Acraman, a circular ephemeral playa lake about 20 km in diameter
Originally posted by rickymouse
I think I'm going to go get a hundred cases of beer and hide in the basement till this all blows over. Shoot, no bathroom in the basement....scrap the basement part.