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Advances in Astrophysics
AdAp > Volume 4, Number 3, August 2019

Ouamuamua (A/2017U1), Panspermia, and Intelligent Life in the Universe

Download PDF  (350.2 KB)PP. 121-127,  Pub. Date:September 1, 2019
DOI: 10.22606/adap.2019.43005

Author(s)
N.C. Wickramasinghe, D.T. Wickramasinghe, E.J. Steele
Affiliation(s)
Buckingham Centre for Astrobiology, University of Buckingham, Buckingham MK18 1EG, UK; Centre for Astrobiology, University of Ruhuna, Matara, Sri Lanka; Institute for the Study of Panspermia and Astrobiology, Gifu, Japan
Institute for the Study of Panspermia and Astrobiology, Gifu, Japan; College of Physical and Mathematical Sciences, Australian National University, Canberra, Australia
Centre for Astrobiology, University of Ruhuna, Matara, Sri Lanka; CY O'Connor ERADE Village Foundation, Piara Waters, WA, Australia
Abstract
We examine a range of arguments relating to the existence of extraterrestrial life and the possible distribution of intelligent life in the galaxy. It has recently been reported that the object (Ouamuamua (A/2017U1)) that transited the solar system in a hyperbolic orbit exhibits certain features that cannot be readily explained on the basis of it being a naturally-occurring comet or asteroid. The interesting conjecture by Bialy and Loeb that Ouamuamua (A/2017U1) could be an artificial construct of an alien civilization is re-examined. The possibility that Ouamuamua may be a dark cometary body, in which unobserved gaseous emissions may have led to departures from a Keplerian orbit, remains a more conservative alternative possibility. We discuss the implications of the discovery of light sails or similar artifacts, as proposed by Bialy and Loeb, in relation to the validity of galaxy-wide panspermia and the prevalence of life throughout the universe.
Keywords
Exobiology, panspermia, comets, extraterrestrial intelligence, SETI
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