陨石撞击或把地球生命送上火星
<p><span word="The">The</span> <span word="asteroid">asteroid</span> <span word="that">that</span> <span word="wiped">wiped</span> <span word="out">out</span> <span word="the">the</span> <span word="dinosaurs">dinosaurs</span> <span word="may">may</span> <span word="have">have</span> <span word="catapulted">catapulted</span> <span word="life">life</span> <span word="to">to</span> <span word="Mars">Mars</span> <span word="and">and</span> <span word="the">the</span> <span word="moons">moons</span> <span word="of">of</span> <span word="Jupiter">Jupiter</span>, <span word="US">US</span> <span word="researchers">researchers</span> <span word="say">say</span>.</p><p><span word="They">They</span> <span word="calculated">calculated</span> <span word="how">how</span> <span word="many">many</span> <span word="Earth">Earth</span> <span word="rocks">rocks</span> <span word="big">big</span> <span word="enough">enough</span> <span word="to">to</span> <span word="shelter">shelter</span> <span word="life">life</span> <span word="were">were</span> <span word="ejected">ejected</span> <span word="by">by</span> <span word="asteroids">asteroids</span> <span word="in">in</span> <span word="the">the</span> <span word="last">last</span> 3.5<span word="bn">bn</span> <span word="years">years</span>.</p><p><span word="The">The</span> <span word="Chicxulub">Chicxulub</span> <span word="impact">impact</span> <span word="was">was</span> <span word="strong">strong</span> <span word="enough">enough</span> <span word="to">to</span> <span word="fire">fire</span> <span word="chunks">chunks</span> <span word="of">of</span> <span word="debris">debris</span> <span word="all">all</span> <span word="the">the</span> <span word="way">way</span> <span word="to">to</span> <span word="Europa">Europa</span>, <span word="they">they</span> <span word="write">write</span> <span word="in">in</span> <span word="Astrobiology">Astrobiology</span>.</p><p><span word="Thousands">Thousands</span> <span word="of">of</span> <span word="potentially">potentially</span> <span word="life">life</span>-<span word="bearing">bearing</span> <span word="rocks">rocks</span> <span word="also">also</span> <span word="made">made</span> <span word="it">it</span> <span word="to">to</span> <span word="Mars">Mars</span>, <span word="which">which</span> <span word="may">may</span> <span word="once">once</span> <span word="have">have</span> <span word="been">been</span> <span word="habitable">habitable</span>, <span word="they">they</span> <span word="add">add</span>.</p><p>"<span word="We">We</span> <span word="find">find</span> <span word="that">that</span> <span word="rock">rock</span> <span word="capable">capable</span> <span word="of">of</span> <span word="carrying">carrying</span> <span word="life">life</span> <span word="has">has</span> <span word="likely">likely</span> <span word="transferred">transferred</span> <span word="from">from</span> <span word="both">both</span> <span word="Earth">Earth</span> <span word="and">and</span> <span word="Mars">Mars</span> <span word="to">to</span> <span word="all">all</span> <span word="of">of</span> <span word="the">the</span> <span word="terrestrial">terrestrial</span> <span word="planets">planets</span> <span word="in">in</span> <span word="the">the</span> <span word="solar">solar</span> <span word="system">system</span> <span word="and">and</span> <span word="Jupiter">Jupiter</span>," <span word="says">says</span> <span word="lead">lead</span> <span word="author">author</span> <span word="Rachel">Rachel</span> <span word="Worth">Worth</span>, <span word="of">of</span> <span word="Penn">Penn</span> <span word="State">State</span> <span word="University">University</span>.</p>
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