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" ... 4.) Mars didn’t have life until Earth seeded it, naturally. 65 million years ago, a very large, fast-moving body impacted Earth, creating Chixulub crater and kicking up enough material to blanket the Earth in a cloud of debris, leading to the fifth great mass extinction in Earth’s history. And, like many massive impacts, this one likely kicked up small pieces of Earth all the way into space, the same way that impactors on the Moon or Mars send meteors throughout the Solar System, where some of them eventually land on Earth. ... "
" ... But Mojzsis is quick to point out that such impactors --- well after our Earth’s core was chemically-closed to accretion of additional elements --- is not unexpected. But it does bring yet another element of serendipity to Earth’s young geologic evolution. We may be here to talk about all this because such elements were readily accessible to jump-start prebiotic chemistry on Earth’s surface. ... "
" ... If a fragment of a long-period comet struck Earth, it would likely do so at speeds as high as 50 km per second as opposed to 20 km per second for asteroid impactors, Simone Marchi, Principal Scientist at the Southwest Research Institute in Boulder, Colo., told me. Therefore, he says, a cometary impactor larger than 5-10 km coupled with such a high impact speed, would probably produce a crater much larger than Chicxulub. ... "
" ... Sori says that in years past, some researchers posited the idea that Mercury’s crust and outer mantle had lost its outer mantle and crust after being slammed by giant impactors. Or even that being so close to the Sun, the solar wind might have simply blown away a significant portion of the planet’s rocky outer layers. ... "
" ... This graph shows the energy released by potential impactors of various sizes along with estimates of ... [+] the frequency of such impactors. There are many uncertainties with this graph, which do not reflect the outcomes we can anticipate for collisions over the next few decades to millennia. (Encyclopaedia Britannica/UIG Via Getty Images) ... "