A colossal asteroid is expected to shoot past Earth in just days, according to reports from NASA.
Astronomers believe that the rock, known as 138971 (2001 CB21), is potentially hazardous and measures between 1,840 and 3,940ft in diameter.
The space rock will zoom past Earth at almost 26,890 miles per hour, according to their calculations.
It is estimated size makes it much bigger than the world's tallest building, Burj Khalifa which stands at 2,717 ft in Dubai, and almost four times bigger than The Shard at around 1,020 ft in London.
NASA spotted the asteroid via its database of NEO Earth Close Approaches.
The US space agency has classified it as a near-Earth object and believes it will reach its closest point to Earth at 7.59am on Friday March 4.
But it will not pose any danger to people on Earth as it will still be more than three million miles away at its nearest point.
This is estimated to be around 12.78 Lunar Distance which means it will be more than 12 times further away than the moon.
There is also a chance that the asteroid is not as large as its upper estimate due to a wide margin for error in the calculations.
But the lower estimate would still be large, coming in bigger than America's Empire State Building.
The magnitude of the asteroid is recorded at 18.4H which refers to the "visual magnitude an observer would record" if it were placed 1 Astronomical Unit away.
It was first found in February 2001 by the Lincoln Near-Earth Asteroid Research project in New Mexico, USA, and last seen near Earth in February 2021.
The rock has been approaching the planet on an almost yearly basis and is due to come back again next February and April.
An astronomer managed to photograph the 2001 CB21 rock at the end of January as it moved towards Earth from more than 21.5 million miles away.
The same astronomer recently captured the asteroid once more as it moves closer.
It can also be seen moving through space via a time-lapse video made from 139 images captured while it was being observed.
Astronomer Gianluca Masi used a telescope to photograph the asteroid on Wednesday when it was approximately about 6.2 million miles away.
He told Newsweek : "The advanced technology we use makes our telescopes among the best ones on the planet to track and share even the fastest, demanding asteroids."
The expert told how people often query why the number of near-Earth objects has supposedly increased in recent years.
"Actually, it is the continuously improving technology which is making it possible for us to spot smaller and smaller objects which we were simply missing before," he added.
