NASA has issued a stark warning regarding the presence of tens of thousands of asteroids orbiting near Earth, capable of devastating entire cities. According to NASA official Kelly Fast, at a recent American Association for the Advancement of Science event, there are approximately 25,000 asteroids larger than 140 meters in diameter that pose a threat, yet only about 40% of their locations are known. This lack of knowledge highlights a critical vulnerability in humanity's defense against such cosmic threats.

To improve asteroid detection capabilities, NASA plans to launch a new space telescope called the Near-Earth Object Surveyor next year. This telescope will utilize thermal radiation to detect asteroids and comets that have previously gone unnoticed, moving beyond the conventional method of observing reflected sunlight. Fast expressed hope that this technology will enhance identification of possible hazardous objects and increase our understanding of these celestial bodies that could one day pose risks to Earth.

The urgency of this situation is compounded by the fact that current global measures to manage or defend against potential asteroid impacts are insufficient. Without significant advancements in detection and potential mitigation strategies, the risks remain high. The scientific community's response to this impending issue underscores the need for international collaboration and increased funding aimed at developing reliable methods to protect Earth from the threat of asteroids, affirming the importance of acting before a disaster occurs.