A potentially catastrophic astroid 20 kms in size is currently 40,000 kms from earth (moon apx 384,400 km).
http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=11320523SHOCK ASTEROID WARNING: Planet earth faces 100 YEARS of killer strikes starting in 2017
A previously unknown asteroid belt has been located in deep space and is now hurtling towards our part of the solar system.
It means a 'global killer' could collide with Earth as soon as 2020, wiping out life as we know it and changing the climate for millennia.
The terrifying predictions came as NASA revealed disturbing new data showing 400 impacts are expected between 2017 and 2113, based on new observational data of objects seen in space over the past 60 days.
Most will have a maximum diameter of around 100 metres - the size of seven double decker buses - and the potential to cause significant damage.
But concerned scientists warned a colossal "monster" is also heading our way, with one 'mega' asteroid threatening earth in just SIX years.
It follows claims this week by physicist Professor Brian Cox that a bus-sized asteroid, named 2014 EC, came within 61,637 kilometres (38,300 miles) of Earth in March.
He said there is an "asteroid with our name on it" and it is only a matter of time before an asteroid large enough to wipe out the human race collides with Earth.
Many believe an asteroid was responsible for killing the dinosaurs with a similar life-changing event potentially just around the corner.
Professor Bill Napier, an astronomy expert at the University of Buckingham, said a strike by either an asteroid or debris from a comet could have devastating consequences.
He said: "If something like this happened, depending on where it hit it would be absolutely life-altering.
"The atmospheric chemistry would be upset by cutting out sunlight. It would be like a nuclear winter and could last for tens of thousands of years.
"These comets are 200-300km (186 miles) in diameter they are sheer monsters and could sterilise the earth if we are hit by one.
"The more immediate risk comes from sub-kilometre (smaller) asteroids and there are tens of thousands of these in space which are quite capable of causing damage on a regional scale.
"One hit Siberia in 1908 and luckily it was not in a populated area. Had this happened in London it would have wiped out everything within the M25 and you would have heard the collision in another country."
And experts warned of the possibility of something much bigger striking earth in 2020.
Asteroid 2012 DA14, discovered by astronomers at the LaSagra Observatory in Spain, currently has less than a one per cent chance of hitting but scientists can't rule out the possibility that it might smash into our planet.
Paul Chodas, a planetary astronomer at NASA's Jet Propulsion Laboratory (JPL) said: "The orbit for 2012 DA14 is currently very Earth-like, which means it will be very close to Earth on a regular basis."
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http://www.express.co.uk/news/nature/507480/Asteroid-Strikes-Earth-Damage-Nasa-D...