The key to avoiding such a devastating scenario lies with asteroid detection, by finding all the asteroids that could hit Earth.
Space agency B612 President Danica Remy told NBC: “It’s 100 percent certain that we’re going to get hit, but we’re not 100 percent certain when.”
Planetary defence experts are now working on technologies to help prevent the earth from colliding with giant space rocks.
Ms Remy claimed: “The real issue is that we need to have an inventory of all the asteroids.”
The most well known example of an unexpected asteroid event was in 2013.
A 55-foot-wide asteroid hit the atmosphere over the Ural city of Chelyabinsk in Russia.
The asteroid mostly burnt up in the atmosphere before falling to the ground.
It shattered windows and injured more than 1,000 people.
University of Maryland astronomer James Bauer said: “We weren’t aware of the Chelyabinsk asteroid beforehand.
“It more or less came out from a geometry that was not viewable.
“It traveled on a solar approach that made it hard to detect.”
More to follow…