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...ocity]] and be lost to space when buffeted by [[solar wind]] or stirred by collision. Planets without a thick atmosphere lack the matter necessary for primal [[ ...f the Moon commenced when a Mars-sized body struck the Earth in a glancing collision late in its formation, and the ejected material coalesced and fell into orb ...

[[File:Artist's concept of collision at HD 172555.jpg|thumb|150px|left|Collision between two planetary bodies (artist concept).]] ...

* Catastrophic collision by a body large enough to blow away a significant percentage of the atmosph ...

...r 2013 }}</ref> The presence of the minerals may have been the result of a collision with an [[asteroid]] or [[comet]] according to the scientists.<ref name="NA ...

...er 2013}}</ref> The presence of the minerals may have been the result of a collision with an [[asteroid]] or [[comet]] according to the scientists.<ref name="NA ...

...www.latimes.com/science/sciencenow/la-sci-sn-beta-pictoris-star-planet-gas-collision-comets-carbon-monoxide-20140307,0,1884709.story |date=7 March 2014 |work=[[ ...tured meteoroid would typically take some tens of millions of years before collision with a planet,<ref name='Belbruno2012' /> there are documented viable Earth ...

...[NASA]]}}</ref> The presence of the minerals may have been the result of a collision with an [[asteroid]] or [[comet]].<ref name=NASA-20131211/> ...

...ld mountains]] such as the [[Rockies]] or the [[Himalayas]], formed by the collision and buckling of tectonic plates, or to [[subduction zones]] like the [[Ande ...

...mber 15. The ascent stage was then deliberately crashed into the Moon in a collision recorded by [[seismometer]]s deployed on Apollo 17 and previous Apollo expe ...

...the planet, Professor presented evidence that the cooling even was caused collision with "a dense trail of material from a large disintegrating comet."<ref>{{c ...