The asteroid, dubbed Asteroid 2018 WX1, should pass the morning of Friday 7 December. NASA scientists at the Jet Propulsion Laboratory are watching a flyby 9.0Tora GMT (UTC). The passage of the asteroid will be preceded by a much smaller barrel, 91.8 feet wide (28 m) beyond the planet around 6.51am GMT. The largest of the two asteroids is the most formidable object and is comparable in size to the Big Ben tower at Elizabeth in Westminster, London.
NASA astronomers estimate measurements of excess asteroids somewhere in the range of 134.5ft to 298.5ft (41m at 91m).
According to the space agency, the asteroids in the higher end of this estimate have the potential to devastate the impact.
NASA said, "Space is being excavated smaller than about 25 meters ̵
" If a rocky meteoroid more 25 meters large but smaller than one kilometer – just over 1/2 mile – had to hit the Earth, it would probably cause local damage to the impact area
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"We believe that anything bigger than one or two kilometers – one kilometer is a little over one -move miles – could have effects all over the world
"At 5.4 kilometers in diameter, the largest known potentially dangerous asteroid is Toutatis."
The asteroids measure about 328 feet (100 m) across the Earth once every 2,000 years or so.
Fortunately there is no risk that the asteroid may sbat tere on the planet at any time
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Instead, the asteroid will make a so-called Approach close to Earth tomorrow morning.
Approaches close to the Earth involve all asteroids and comets that fly from the Earth within 0.05 astronomical units (au) or 4.6 million miles (7.49 million km) of the planet  Tomorrow Asteroid WX1 will reach a minimum distance from the Earth of 0.01235 au or 1.14 million miles (1.48 million km).
This is the equivalent of 4.83 Lunar Distances (LD) – 4.81 times the distance from the Earth to the Moon.
NASA said: As orbiting around the Sun, Near-Earth objects can occasionally approach the Earth.
"Note that an" near "passage can be astronomically very far in human terms: millions or even tens of millions of kilometers."  Asteroid WX1 whizzes at dizzying speeds of 20.065.32 or 8.97 kilometers per second.
NASA then expects the asteroid to reappear near the Earth on August 9, 2019.