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Finding a second sample of life on earth

Davies, P C W; Lineweaver, Charles

Description

If life emerges readily under Earth-like conditions, the possibility arises of multiple terrestrial genesis events. We seek to quantify the probability of this scenario using estimates of the Archean bombardment rate and the fact that life established itself fairly rapidly on Earth once conditions became favorable. We find a significant likelihood that at least one more sample of life, referred to here as alien life, may have emerged on Earth, and could have co-existed with known life. Indeed,...[Show more]

dc.contributor.authorDavies, P C W
dc.contributor.authorLineweaver, Charles
dc.date.accessioned2015-12-13T22:52:09Z
dc.date.available2015-12-13T22:52:09Z
dc.identifier.issn1531-1074
dc.identifier.urihttp://hdl.handle.net/1885/81431
dc.description.abstractIf life emerges readily under Earth-like conditions, the possibility arises of multiple terrestrial genesis events. We seek to quantify the probability of this scenario using estimates of the Archean bombardment rate and the fact that life established itself fairly rapidly on Earth once conditions became favorable. We find a significant likelihood that at least one more sample of life, referred to here as alien life, may have emerged on Earth, and could have co-existed with known life. Indeed, it is difficult to rule out the possibility of extant alien life. We offer some suggestions for how an alternative sample of life might be detected.
dc.publisherMary Ann Liebert Inc.
dc.sourceAstrobiology
dc.subjectKeywords: article; astronomy; biogenesis; time; Biogenesis; Earth (Planet); Time Factors Biogenesis; Impact frustration; Origin of life
dc.titleFinding a second sample of life on earth
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume5
dc.date.issued2005
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub9722
local.type.statusPublished Version
local.contributor.affiliationDavies, P C W, Macquarie University
local.contributor.affiliationLineweaver, Charles, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.startpage154
local.bibliographicCitation.lastpage163
local.identifier.doi10.1089/ast.2005.5.154
dc.date.updated2015-12-11T10:49:21Z
local.identifier.scopusID2-s2.0-18144374213
CollectionsANU Research Publications

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