Dark Threat. Bruce Dorminey.
by Dorminey, Bruce; ProQuest Information and Learning Company.
Series: SIRS Enduring Issues 2006Article 56Science. Publisher: Astronomy, 2005ISSN: 1522-3264;.Subject(s): Brown dwarfs | Comets -- Collisions with Earth | Extinction (Biology) | Nemesis (Star) | Oort cloud | Solar system -- Motion in space | StarsDDC classification: 050 Summary: "In February 1984, University of Chicago paleontologists David Raup and J. John Sepkoski published a short paper in the Proceedings of the National Academy of Sciences announcing that extinction rates in Earth's geologic past appeared to be periodic. Raup and Sepkoski attributed this observed periodicity to galactic forces acting on our surrounding cometary reservoir as we travel through the Milky Way." (ASTRONOMY) This article discusses mass extinctions on Earth, what may have caused them and what could cause future extinctions.| Item type | Current location | Call number | Status | Date due |
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| REF SIRS 2006 Science Article 54 Father of the A-Bomb. | REF SIRS 2006 Science Article 54 My Grandfather and the Bomb. | REF SIRS 2006 Science Article 55 Leroy's Launch. | REF SIRS 2006 Science Article 56 Dark Threat. | REF SIRS 2006 Science Article 57 Dr. Feynman's Doodles. | REF SIRS 2006 Science Article 58 Shuttle Roars Back to Space After 2 1/2-Year Absence. | REF SIRS 2006 Science Article 58 Discovery Returns to Earth. |
Articles Contained in SIRS Enduring Issues 2006.
Originally Published: Dark Threat, July 2005; pp. 40-45.
"In February 1984, University of Chicago paleontologists David Raup and J. John Sepkoski published a short paper in the Proceedings of the National Academy of Sciences announcing that extinction rates in Earth's geologic past appeared to be periodic. Raup and Sepkoski attributed this observed periodicity to galactic forces acting on our surrounding cometary reservoir as we travel through the Milky Way." (ASTRONOMY) This article discusses mass extinctions on Earth, what may have caused them and what could cause future extinctions.
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