An astrophysicist described what would happen if a black hole that’s only 1 millimeter wide suddenly appears on Earth. According to the scientist, the black hole’s gravitational pull would still completely tear Earth apart despite its tiny size.

Black holes are some of the most powerful forces in space. Due to the immense gravitational force they exert, they are oftentimes regarded as one of the most dangerous cosmic threats that can destroy Earth in an instant.

Recently, a scientific discussion on Quora explored the possibility of a black hole existing on Earth. In this kind of scenario, the discussion focused on a tiny black hole that’s only a millimeter wide.

According to Hossam Aly, who holds a Ph.D. in astrophysics from the University of Leicester in England, if a 1-millimeter black hole suddenly appears on the Earth’s surface, it would still have immense gravitational forces that can affect almost a third of the entire planet.

This means that everything within the reach of the black hole’s influence would be subjected to its gravitational pull.

“Assuming the black hole appears on the Earth's surface, its sphere of influence would have a radius of about a third of the earth radius,” Aly wrote on Quora. “All the matter in that region would feel a stronger gravity from the black hole than from the Earth.”

The astrophysicist then added that if the black hole appeared with a velocity of about 27,000 miles per hour, it will travel across Earth carrying its sphere of influence. Aly noted that as the black hole rampages across the planet, it would kill off every living creature on Earth’s surface. In addition, it will consume Earth’s materials until the planet is completely destroyed.

“If the black hole appears on the surface with a relative velocity of less than 12 km/s, it will orbit the Earth along with its sphere of influence,” Aly explained. “That means the destruction of the Earth's crust and most of its mantle and the death of everything living on its surface.

“A significant fraction of the Earth mass becomes available food to be accreted by the black hole,” he added.

MIT-Blackhole-Jet Artist's impression of an inner accretion flow and a jet from a supermassive black hole when it is actively feeding from a star. Photo: ESO/L. Calçada