In a significant move to protect Earth, NASA has revealed its strategy against "planet killer" asteroids. This initiative is inspired by the catastrophic event that led to the extinction of dinosaurs 66 million years ago. NASA's National Preparedness Strategy and Action Plan outlines a comprehensive approach to tackle dangerous near-Earth objects (NEOs).
Defensive Options: Spacecraft or Nuclear Solutions?
Although there is no current asteroid threat, NASA is preparing for worst-case scenarios. One proposal includes deploying a "1,000-strong army" of spacecraft. These spacecraft would intercept and deflect a large asteroid approaching Earth. In more extreme situations, NASA may consider a nuclear option. This approach echoes the plot of the 1998 film "Armageddon," where a nuclear device could disrupt an asteroid on a collision course.
DART Mission: A Successful Test
NASA's primary defence mechanism involves kinetic impactors. In 2022, the agency successfully tested its Double Asteroid Redirection Test (DART) mission. This involved crashing a spacecraft into a harmless asteroid, successfully changing its trajectory. This test proved NASA's ability to redirect hazardous space rocks.
In cases where an asteroid is spotted with little time, NASA may use nuclear explosives. If a massive asteroid approaches Earth within months, a nuclear explosion could either deflect or fragment it. This could prevent a planet-wide disaster.
Understanding the Potential Impact
NASA's planning acknowledges the potential consequences of a catastrophic asteroid strike. An impact similar to the Chicxulub event would unleash intense heat and vaporise materials. Dust clouds would block sunlight, triggering an "impact winter." Such a scenario could lead to mass extinction, akin to the event that wiped out the dinosaurs.
NASA’s proactive measures show the importance of planetary defence. The world watches as they prepare for potential threats from space.
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