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en.wikipedia.org/wiki/Alvarez_hypothesis

The most easily observable consequence of such an impact would be a ... acid rain, depending on what type of rock the asteroid struck.

www.pnas.org/content/95/19/11028.full

Sep 15, 1998 ... Confirmation that a large meteorite impact in Mexico correlates with a ... Like all good hypotheses, the Alvarez impact hypothesis generated a ...

www.pbs.org/wgbh/evolution/extinction/dinosaurs/asteroid.html

Hypothesis: Asteroid Impact. Did a collision with a giant asteroid or comet change the shape of life on Earth forever? It is widely agreed that such an object -- 10 ...

news.nationalgeographic.com/news/2013/09/130910-comet-impact-mammoths-climate-younger-dryas-quebec-science

Sep 10, 2013 ... A proponent of the impact hypothesis, a geological consultant ... "So that convinced us they formed from a meteorite impact," Sharma said.

blogs.scientificamerican.com/history-of-geology/httpblogsscientificamericancomhistory-of-geology20110727the-younger-dryas-impact-hypothesis

Jul 27, 2011 ... Based on this discovery Firestone later developed as alternative explanation the meteorite hypothesis, according to him the hypothesis could ...

www.space.com/26142-moon-formation-giant-impact-theory-support.html

Jun 5, 2014 ... "The Giant Impact Hypothesis is very good in explaining most of the moon's ... Meteorite impacts on the moon are the main source of rock ...

www.space.com/19275-moon-formation.html

Jan 15, 2013 ... There are three theories as to how our planet's satellite could have been created: the giant impact hypothesis, the co-formation theory and the ...

www.psi.edu/epo/moon/moon.html

Our giant impact hypothesis had the advantage of invoking a stochastic catastrophic ... on the aggregation of planets out of countless asteroid-like bodies called ...

www.livescience.com/26933-chicxulub-cosmic-impact-dinosaurs.html

Feb 7, 2013 ... Artist's impression of a 6-mile-wide asteroid striking the Earth. Scientists now have fresh evidence that such a cosmic impact ended the age of ...