Although, for many comets or asteroids, there is a higher density of debris associated with thelocation of the main body, over enough time, the debris will get smeared out along the orbit to such a sufficient degree that the meteor shower can become very consistent year-to-year. The Leonids have not yet reached that stage, and as such, they still peak roughly every 33.25 years.These large masses, multiple kilometers across, contain comparable energies to the Chicxulub impactor....
distribution of meteors that strike Earth. However, there are additional strikes that also occur, and they cannot be explained by our asteroid belt alone.Most megafaunal species were wiped out 65 million years ago; a comparable catastrophe would ensue today.... [+] layer of ash, and its elemental composition, that teaches us about the extraterrestrial origin of the impactor that caused the mass extinction event. Earth has hundreds of meters worth of sedimentary rock covering its surface practically everywhere, with limestone making up about 10% of the sedimentary rock in total.Gravitational perturbations from other masses, like planets, are statistically random....
orbiting the Sun that it is not bound to. Depending on the orientation of the spacecraft's relative trajectory, it will either receive a speed boost or a de-boost with respect to the Sun, compensated for by the energy lost or gained by the planet orbiting the Sun. This occurs, naturally and in an uncontrolled fashion, for all asteroids and comets that pass close by another planet.
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