The 1.5-mile wide space rock – with the catchy name 2003 SD220 – is on a NASA warn list as astronomers believe it could cause “significant regional damage” if it strikes Earth.
A direct hit from the gigantic asteroid would be enough to destroy a whole continent – or worse.
The cosmic missile – which eerily coincides with conspiracy theories that a giant mysterious hidden planet called Nibiru will pass Earth this month – is not predicted to hit us.
But space boffins admit they are struggling to predict its path – as the gravity of other planets and stars are causing it to “wobble”.
But the US space agency is watching the asteroid carefully.
It said: "These objects are monitored by NASA with contributions from others including amateurs.
"The reason they can become hazardous is that their trajectory can variate due to gravitational fields from planets or stars, or other objects."
An giant asteroid skimmed past Earth at Halloween as we appear bombarded from deep space.
NASA has admitted it is preparing a disaster action plan – straight out of a Hollywood blockbuster – to knock away space objects heading for Earth, like a game of cosmic billiards.
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