A giant 20-mile asteroid could remain undecided on a collision course toward Earth, an expert has revealed. Earth Science author Corey Powell gave a "qualified" yes when asked whether a apocalyptic asteroid could surprise experts on Earth in only 20 years. He wrote on Quora: "The killer could not come from the asteroid belt."
"Astronomers have already plotted the orbit of every asteroid that size."
"There is no object that
There is only one way to do this to armageddon astroid could make an unexpected rendezvous with Earth.
Mr Powell added: "If it were a giant comet or dislodged Kuiper Belt object, it would be very hard to detect."
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What would be the consequences of a 20-mile wide asteroid hitting Earth?
A 20-mile wide asteroid space rock that hit Earth at the end of the Cret aceous period.
Compounding the problem, the asteroid would also be moving at a high velocity, given its steep path toward the Sun.
Mr Powell, a former editor of Discovermagazine.com
He said: "All of Earth's surface would be set on fire.
"There would be tremendous earthquakes and tsunamis, followed by massive volcanism around the impact zone."
"The ozone layer would be destroyed." The oceans would turn acidic. The Sun would be blotted out, probably for decades.
"All surface infrastructure would be destroyed.
How could humanity defend itself against such asteroid?
Mr Powell believes the approach to the highest likelihood of success would be to explode multiple nuclear warheads next to the asteroid,
He said: "If NASA, Roscosmos, the European Space Agency and the Chinese Space Agency (plus private industry) started cooperating right away, I can imagine a coordinated set of launches
"Unlike many of the cynics, I think the child of international cooperation would happen."
"The threat is just too huge. All other concerns would become secondary; there will be no nation and government to worry about if this thing hits. "