A short video, from Discovery Science Channel, about the KT Boundary, iridium, and a giant space rock colliding with Earth, which resulted in our last "mass extinction," the death of the dinosaurs:
http://science.discovery.com/videos/100-greatest-discoveries-shorts-kt-boundary-discovery.html
The scientist who appears in the video:
http://www.psi.edu/about/staff/betty/betty.html
Recently posted here, about the dramatic increase in space rock fly-bys and hits: "Fire in the Sky"
Another video, about the oort cloud and why space rocks are flying toward us: "Something Wicked This Way Comes"
Two news articles cited in the above video:
"Six apocalyptic events, including the extinction of the dinosaurs, have all occurred, like clockwork, every 26 to 30 million years." http://www.telegraph.co.uk/science/science-news/3300270/Does-the-Sun-have-a-doomsday-twin.html
"Evidence Mounts for the Sun's Companion Star"
http://www.physorg.com/news65117758.html
Pictures and explanation of several craters left by past space rock collisions, including the one cited in the first video: http://www.solarviews.com/eng/tercrate.htm
So there you have it.
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