A fresh study published in the journal science has unveiled that life on Earth will not come to an end due to crashing comets. 

Ostensible long-period comets, which were long thought to come from the outer region of the Oort cloud, should rarely cross Earth's orbit.

The Oort Cloud is a remnant of the nebula, which is believed the solar system came from about 4.5 billion years ago.

Oort Cloud, which encircles the solar system from a around 93 billion miles from the Sun is believed to contain billions of comets, most of which can not be seen even with powerful telescopes as they are too small and distant to be seen.

Computer simulation was used by researchers at the University of Washington to model the development of comet clouds for 1.2 billion years.

The new study suggests that a considerable share of observable long-period comets actually come from the inner, not the outer, Oort Cloud.

Comets coming from the Oort Cloud would be ejected from the solar system by gravitational interactions with Saturn and Jupiter, providing guard to the inner solar system.
 
However, Earth still has threats from asteroids, which are made of ice and rock. It may be noted here that many scientists believe that dinosaurs were made extinct by the collision from an asteroid as many as 65 million years earlier.