According to The Express;
The gigantic missile thought to measure almost a mile across will brush closer than previous monsters which have sparked a global panic.On this occasion a collision seems unlikely - but it doesn't take much of an orbital perturbation to put an Earth grazer onto a collision course.
Worried astronomers warned 1999 FN53, which is an eighth of the size of Mount Everest, will skim the Earth in THREE DAYS.
A collision would be nothing short of catastrophic triggering mass destruction, earthquakes and global extinction.
The monster is more than TEN TIMES bigger than other meteorites currently visible on NASA's Near Earth Object radar.
It is also double the size of the gargantuan 2014-YB35 which had astronomers around the world watching the skies in March.
Experts warn a collision would trigger an explosion similar to millions of megatons of TNT and would be capable of killing 1.5 billion people.