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). According to a theory proposed to explain this phenomenon1, gravitational encounters between the Solar System and interstellar clouds of intermediate to large… (More)
DOI: 10.1038/317338a0


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