Chinese researchers want to send more than 20 of China‘s largest rockets to practice turning away a sizable asteroid – a technique that may eventually be crucial if a killer rock is on a collision course with Earth.

Sometime between late 2021 to early 2022, the United States will launch a robotic spacecraft to intercept two asteroids relatively close to Earth, reports Reuters.

When it arrives a year later, the NASA spacecraft will crash-land on the smaller of the two rocky bodies to see how much the asteroid’s trajectory changes.

At China’s National Space Science Center, researchers found in simulations that 23 Long March 5 rockets hitting simultaneously could deflect a large asteroid from its original path by a distance 1.4 times the Earth’s radius.

Their calculations are based on an asteroid dubbed Bennu, orbiting the sun, which is as wide as the Empire State Building is tall. It belongs to a class of rocks with the potential to cause regional or continental damage. Asteroids spanning more than 1 km would have global consequences.

China’s National Space Science Center cited a recently published study in Icarus, a journal on planetary science. Long March 5 rockets are key to China’s near-term space ambitions – from delivering space station modules to launching probes to the Moon and Mars.