NASA scientist Kelly Fast has issued a stark warning about the potential for a catastrophic asteroid impact on Earth. She emphasizes the threat posed by the 15,000 undetected near-Earth asteroids, which could devastate entire cities. Fast highlights the challenge of detecting these 'city killers' due to their size and orbit, which prevents them from reflecting sunlight. She explains that while larger asteroids are easier to track, smaller ones constantly hit the Earth without us even knowing. Fast's concern is not only about the potential destruction but also the lack of preparedness. She stresses the need for proactive measures, such as the upcoming deployment of a 'Near-Earth Object Surveyor space telescope' to detect these hidden threats. However, Fast acknowledges the limitations of current technology, noting that even if we detect these asteroids, we might not have the means to stop them. She cites the 2022 Dart mission, which successfully altered the course of an asteroid, but suggests that replicating this feat with a 'city killer' would be extremely challenging. Fast urges the need for investment in planetary defense, stating that we could be prepared for this threat and in a better position to mitigate potential disasters. The article concludes with a thought-provoking question: Are we ready for the next YR4 asteroid, which has a 4% chance of striking the moon in 2032? The answer may lie in our ability to detect and respond to these cosmic threats.
