By bombs Donnelly meant the untold number of asteroids and comets that fill the heavens around us which on perhaps not a few occasions have smashed into Earth itself, and may do so again.

Through revolutionary new techniques in observation, detection and photography, modern astronomers and astrophysicists have now identified two new classes of celestial objects which could pose a real danger to our planet within the foreseeable future, called NEA’s (Near Earth Asteroids) and ECC’s (Earth-Crossing Comets).

On September 29, asteroid "4179 Toutatis" passed within 1.6 million kilometres of Earth. Its approach was the closest in this century of any known asteroid the size of Toutatis, which measured around 4.6 kilometres in length. If it had struck the Earth, we could have faced what scientists have dubbed "a mass extinction event."

Scientists believe the asteroid poses no risk at least through 2562, when Toutatis will pass within 400,000 kilometers of Earth – but astronomers admit there are forces in the solar system that can alter an asteroid’s orbit and put it on a collision course with Earth.

Earlier this year, on March 31, an asteroid skimmed past the Earth at a distance of just 6500 kilometres above the ground. Object "2004 FU162", which spans 5-10 metres across, would have burned up as a fireball ending with a smaller explosion, had it ventured into the Earth’s atmosphere. The problem was astronomers did not discover it until after its passing. Scientists have since calculated the asteroid’s orbit was shifted by a whopping 20 degrees because of the Earth’s gravity.

The previous record for the closest asteroid approach to Earth was set on 18 March by an object called "2004 FH" which missed the Earth by about 40,000 kilometres. That was a much larger object, around 30 metres in diameter, but big enough to produce a ...

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