Summary:
- The article discusses how the "crumb trails" left behind by meteoroids as they enter Earth's atmosphere could help identify potential "planet killer" comets years before they reach Earth.
- Researchers have found that the crumb trails, made up of tiny debris from the meteoroids, can be detected and tracked using radar, providing early warning of large comets that could pose a threat to the planet.
- This early detection could give scientists and authorities more time to prepare for and potentially deflect or mitigate the impact of such a comet, which could have catastrophic consequences if it were to collide with Earth.