Mass extinctions and the sun's encounters with spiral arms

@article{Vasisht1998MassEA,
  title={Mass extinctions and the sun's encounters with spiral arms},
  author={Erik M. LeitchGautam Vasisht},
  journal={New Astronomy},
  year={1998},
  volume={3},
  pages={51-56}
}
  • Erik M. LeitchGautam Vasisht
  • Published 1998
  • Physics
  • New Astronomy
  • Abstract The terrestrial fossil record shows that the exponential rise in biodiversity since the Precambrian period has been punctuated by large extinctions, at intervals of 40 to 140 Myr. These mass extinctions represent extremes over a background of smaller events and the natural process of species extinction. We point out that the non-terrestrial phenomena proposed to explain these events, such as boloidal impacts (a candidate for the end-Cretaceous extinction) and nearby supernovae, are… CONTINUE READING
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    • This preprint was prepared with the AAS L A T E X macros v4