Terrestrial mass extinctions, cometary impacts and the Sun's motion perpendicular to the galactic plane

@article{Rampino1984TerrestrialME,
  title={Terrestrial mass extinctions, cometary impacts and the Sun's motion perpendicular to the galactic plane},
  author={Michael R. Rampino and Richard B. Stothers},
  journal={Nature},
  year={1984},
  volume={308},
  pages={709-712}
}
Episodes of mass extinctions on the Earth are now strongly suspected to be cyclical1. We report here that our analysis of the data of Raup and Sepkoski1 suggests that the dominant cyclicity in major marine mass extinctions during at least the past 250 Myr is 30 ± 1 Myr, with the standard deviation of an individual episode being ±9 Myr. We find this terrestrial cycle to be strongly correlated with the time needed for the Solar System to oscillate vertically about the plane of the Galaxy, which… 

Cometary impacts, molecular clouds, and the motion of the Sun perpendicular to the galactic plane

Raup and Sepkoski1 have presented evidence from marine fossils for a 26-Myr periodicity in the occurrence of mass extinctions. Using the same data Rampino and Stothers2 obtained a different period,

Terrestrial record of the Solar System's oscillation about the galactic plane

Impact cratering on the Earth over the past 600 Myr has been partly sporadic, partly episodic. The episodic component is suspected to have been cyclical, with a mean period of ∼32 Myr (refs 1, 2).

The Galactic Theory of Mass Extinctions: an Update

Astronomical and geological evidence is consistent with the hypothesis that mass extinctions of life on Earth are related to impacts of comets whose flux is partly modulated by the dynamics of the

NEOs and Impacts: The Galactic Connection

The orbit of the solar system within the Galaxy is subject both to adiabatic tidal forces and to irregular buffeting caused by encounters with molecular clouds and spiral arms, while the long-period

Orbital stability of the unseen solar companion linked to periodic extinction events

Recent suggestions of astronomical causes for the closely periodic extinction events in the geological record1 and the possible periodicities in the cratering record2 have involved two basic ideas.

How stable is an astronomical clock that can trigger mass extinctions on Earth?

  • P. Hut
  • Physics, Geology
    Nature
  • 1984
The periodicity in mass extinctions observed in the fossil record1,2 may be driven by an astronomical clock consisting of a companion star to the Sun3,4. Each perihelion passage of the companion star

The Sun's motion perpendicular to the galactic plane

The period and amplitude of the Sun's motion perpendicular to the galactic plane are important parameters in some explanations of the terrestrial mass extinctions and cratering records1–5. Here we

Cosmic-ray volleys from the galactic center and their recent impact on the earth environment

It is proposed that outbursts of cosmic ray electrons from the Galactic Center penetrate the Galaxy relatively undamped and are able to have a major impact on the Solar System through their ability

MASS

. The hypothesis relating mass extinctions of life on Earth to impacts of comets whose flux is partly modulated by the dynamics of the Milky Way Galaxy contains a number of postulates that can be

Cometary Impacts on the Biosphere

There is now a wealth of evidence to link impacts by comets and asteroids with catastrophic disruptions of the biosphere and mass extinctions. Such evidence includes impact craters formed close to
...

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