Astrophysicist and Queen guitarist Brian May warns the public about imminent asteroid impacts that can wipe out humanity. He calls for a global effort to immediately detect and monitor potential asteroids that can hit the planet.

Along with royal astronomer Martin Rees and 100 prominent physicists, artists and industry leaders such as Richard Dawkins, Brian Cox and Peter Gabriel, the group signed a declaration demanding an increase of protection using technology to track asteroids near Earth's orbit.

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It's estimated the chances of a large asteroid big enough to wipe out a whole city hitting the Earth can occur in 100 years. May recalled the asteroid explosion in Tunguska, Russia in 1908, stating it only takes one huge impact to erase all humankind.

The Tunguska asteroid exploded some four to six miles above the surface of the Earth. The explosion was so massive its destroyed everything within an area of 800 square miles. Shock waves from the explosion were felt across Europe to the U.K.

According to royal astronomer Martin Rees, the human race should make it a mission to find asteroids before they find humans.

These combined efforts will mark the first World Asteroid Day on June 30, 2015, which is also the anniversary of the Tunguska asteroid explosion. Collaborating with this movement to raise awareness about imminent asteroid threats are the Planetary Society and California Academy of Sciences.

A solution to this intergalactic threat would be Sentinel, which is a privately funded space telescope specially designed to orbit around the Sun in 2019. Sentinel will use infrared cameras to hunt smaller asteroids around 40 meters across.

Even if these space objects are relatively small, they're still powerful enough to destroy an entire city. These small asteroids hit the planet once every 100 years.

An asteroid 150 meters across striking the Earth will unleash an explosive force five times the Hiroshima bomb in World War 2.

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