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An asteroid larger than a blue whale will skim past Earth on Friday at less than one-fifth the distance between our planet and the moon.
The asteroid, 2018 CB, was only discovered by Nasa on Sunday and will blaze by Earth at just 39,000 miles (64,000 kilometres).
Feet - Metres - Expert - Asteroid - Size
It is between 50 and 130 feet (15 and 40 metres) wide and an expert has warned that an asteroid of this size would only get this close to our planet 'once or twice a year'.
According to Nasa the asteroid will pass by at around 17:30 EST (22:30 GMT).
Space - Agency - Asteroids - Miles - Planet
The space agency describes asteroids as 'hazardous' if they come within 4,600,000 miles (7,403,00km) of our planet.
It was first spotted by the Nasa-funded Catalina Sky Survey (CSS) near Tucson, Arizona.
Space - Agency - People - Threat - Planet
The space agency has assured people it does not pose an actual threat of colliding with our planet.
'Although 2018 CB is quite small, it might well be larger than the asteroid that entered the atmosphere over Chelyabinsk, Russia, almost exactly five years ago, in 2013,' said Paul Chodas, manager of the Center for Near-Earth Object Studies at NASA's Jet Propulsion Laboratory in Pasadena, California.
'Asteroids - Size - Close - Planet - Year
'Asteroids of this size do not often approach this close to our planet - maybe only once or twice a year.'
In February 2013 a 19-metre meter (62-feet) meteor exploded in the skies above Chelyabinsk in Russia.
Meteorite - Pieces - Atmosphere
The meteorite broke up into multiple pieces as it entered the atmosphere,...
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