A relative role of comets versus asteroids in the bombardment of the inner planets remains questionable. The uncertainty originates from two main problems. The first is that we do not know with adequate accuracy the real sizes of the cometary nuclei that often look detectable with active comas. The second problem lies in the “fading” of comets; and it is important to value a portion of “dormant” comets in a total population of bodies whose orbits intersect with the Earth and planets. This chapter lays out the authors’ vision of the modern aspects of these problems
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Kuzmitcheva, M., Ivanov, B. (2008). Cometary Hazards. In: Adushkin, V., Nemchinov, I. (eds) Catastrophic Events Caused by Cosmic Objects. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6452-4_3
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