NASA expects the asteroid, called 2019 OD, to fly over our homeworld on a so-called "Earth Close Approach" route. The asteroid will fly in less than three weeks tomorrow afternoon (Wednesday, July 24) after it was first discovered on July 5. The NASA asteroid trackers estimate that the space rock will approach Earth around 2:31 pm (BST). In this case, the giant asteroid races closer than the moon.
Asteroid 2019 OD is a near-Earth Apollo object or NEO.
All NEOs are asteroids and comets that orbit the Sun within the boundaries of the asteroid belt between Mars and Jupiter.
NASA said, "Near-Earth Objects (NEOs) are comets and asteroids that have been orbited by the gravitational pull of nearby planets, allowing them to enter the Earth's neighborhood. [1
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Occasionally A NEO crosses the Earth's orbit and shoots past the planet.
More rarely, NEOs hit Earth unexpectedly, such as the Chelyabinsk Meteor, which exploded over Russia in 2013.
The space rock only had a diameter of 20 m, but the power of eruptions blew out windows in a wide radius, injuring more than 1,000 people with glass splinters.
In this case, asteroid OD is estimated to measure anywhere in the range of 170.6 feet to 393.7 feet (52 meters to 120 meters) in diameter.
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At the top end of this estimate, the asteroid is larger than the clock tower of Big Ben in London and the Statue of Liberty in New York (USA)  9017] Most of the Rocky Asteroids Formed in the Warmer Inner Solar System
So, how close does NASA expect the asteroid to fly by, and there is a real danger tomorrow afternoon through the rock?
The asteroid flies at a blistering speed of about 19.17 km / s or nearly 43,000 mph.
The same stone then approaches the Earth from a distance equal to 0.92 lunar (LD) distances, with one lunar distance Distance to measures the moon.
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This means that the asteroid will safely fly over the earth at a distance of approximately 219,375 miles (353,050 km).
In other words, the asteroid approaches the planet by 0.00236 astronomical units (AU).
A single AE represents the distance from Earth to the Sun or approximately 93 million 149.6 million km.
After the flyby, the asteroid briefly approaches the moon, but then NASA does not expect it to revisit our corner of space.
Brief Facts on Asteroids and Comets:
1. NASA estimates that a football-field-sized asteroid collides with our planet about every 2,000 years.
. 2 An auto-sized asteroid hits the earth at least once a year on average.
. 3 Some of the larger space rocks in the asteroid belt can have a diameter of up to 905 km.
. 4 When icy comets fly around the solar system, their outer layers sublimate in the heat of the sun, leaving a glowing trail.
. 5 A meteor that survives the fiery descent through the Earth's atmosphere is known as a meteorite.