Comets pose a greater impact threat to Earth than asteroids do.

Is it true that comets pose a greater impact threat to Earth than asteroids do?

Unclear. Several sources indicate long-period comets strike at higher velocities and are far harder to detect in advance than near-Earth asteroids, which would make individual comet impacts more destructive and harder to mitigate. However, none of the retrieved items compares the overall frequency or total impact threat of comets versus asteroids, so the claim is only partially supported.

Verdict: PARTIAL LEAN · 3 sources for, 0 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Asteroid impact avoidance. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Asteroid_impact_avoidance

Qicheng, Z., M., L. P., & B., H. G. (2017). Long-period comet impact risk mitigation with Earth-based laser arrays. authors.library.caltech.edu. https://doi.org/10.1117/12.2274726

Nuclear Thermal Propulsion for Human Exploration and Potential Threat Mitigation of Near Earth Objects. (2008). doi.org. https://doi.org/10.2514/6.2008-5034