Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8519907m&link_type=abstract
Presented at the 112th Intern. Astronomical Union Symp. on the Search for Extraterrestrial Life: Recent Developments, Boston, 18
Astronomy and Astrophysics
Astronomy
Companion Stars, Nemesis (Star), Red Dwarf Stars, Sun, Craters, Eccentric Orbits, Extinction, Stellar Parallax
Scientific paper
periodicity seen in both the mass extinctions and large impact cratering on Earth can be explained if one postulates that the Sun has a companion star, orbiting in a moderately eccentric orbit with a major axis of 2.8 light-years. No other explanations that have been suggested are compatible with known facts of physics and astronomy. If the companion is a red dwarf star, the most common kind in the galaxy, then no previous astronomical observations would have found it. A search for red objects with large parallax is now underway and has a good chance of identifying the star in the near future.
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