Brian Cox discusses the progress humanity has made in understanding and mitigating asteroid threats. He explains that most large asteroids crossing Earth's orbit have likely been mapped, and missions have been undertaken to land on asteroids, collect samples, and even test impact strategies to potentially deflect them. However, he highlights the greater challenge posed by comets, which are harder to detect as they often become visible only when they are already approaching. Using the example of Comet Shoemaker–Levy 9, which struck Jupiter and left marks larger than Earth in its atmosphere, he emphasizes the destructive potential of such objects and the current inability to counteract a comet if one were headed toward Earth.

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Source: LADbible Stories, NASA

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