The chances of a giant asteroid striking earth are small however, if it did occur, the devastation would be cataclysmic, wiping out the entire human civilisation. What happened in the past can occur in the future. The tsunami, volcanic eruptions and thick dust clouds ensuing from the blow decimated dinosaurs and nearly 75% of all species. About 66 million years ago, an asteroid about 10-15 kms struck earth.
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Neither the plot nor NASA’s Planetary Defense Coordination Office, made famous by the blockbuster Netflix movie Don’t Look Up is imaginary. The impact would be devastating if it was one or more kilometres wide. The falling piece from a meteoroid 140 metres wide or more will be capable of completely wiping out a city like Chennai. If they are large enough, the charred piece falls through as a meteorite. Most rocks are so small that they burn up completely in the atmosphere due to frictional heating.
Some of these cross their path and collide with earth from time to time, resulting in a spectacular meteor shower. Likewise, leftover materials from the formation of the sun, earth and planets, through the accretion and agglomeration of giant gas and rocks, are scattered as comets, asteroids and meteoroids in the solar system. It could also fuel space mining technologies and unleash the space economy in decades to come.Īround a construction site, bits and pieces of leftover bricks, unused steel rods, and emptied paint canisters are usually strewn. It could one day save humanity from a potential cataclysmic collision by safely deflecting a killer asteroid on its course towards earth. This kinetic impact technique, which appears as the climax of Hollywood sci-fi movies like Deep Impact and Armageddon, is also known as the ‘kick’ method. NASA has confirmed that the collision of the auto-rickshaw sized 600 kilogram weighing DART, on the football stadium-sized Dimorphos, about five billion kilogram in mass (orbiting around the 780 metres wide primary asteroid Didymos), has deflected the trajectory of the pair of space rocks. The story so far: On September 27, at 4:44 am IST, the DART (Double Asteroid Redirection Test) spacecraft collided with the space rock Dimorphos (just 160 metres wide). This screengrab from the NASA live feed shows Dimorphos just before the Double Asteroid Redirection Test (DART) made impact with the asteroid.
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