The Astrobiology of Alien Worlds: Known and Unknown Forms of Life

dc.contributor.authorIrwin, Louis N.
dc.contributor.authorSchulze-Makuch, Dirk
dc.date.accessioned2020-12-10T08:42:44Z
dc.date.available2020-12-10T08:42:44Z
dc.date.issued2020-08-20
dc.date.updated2020-09-03T03:04:57Z
dc.description.abstractMost definitions of life assume that, at a minimum, life is a physical form of matter distinct from its environment at a lower state of entropy than its surroundings, using energy from the environment for internal maintenance and activity, and capable of autonomous reproduction. These assumptions cover all of life as we know it, though more exotic entities can be envisioned, including organic forms with novel biochemistries, dynamic inorganic matter, and self-replicating machines. The probability that any particular form of life will be found on another planetary body depends on the nature and history of that alien world. So the biospheres would likely be very different on a rocky planet with an ice-covered global ocean, a barren planet devoid of surface liquid, a frigid world with abundant liquid hydrocarbons, on a rogue planet independent of a host star, on a tidally locked planet, on super-Earths, or in long-lived clouds in dense atmospheres. While life at least in microbial form is probably pervasive if rare throughout the Universe, and technologically advanced life is likely much rarer, the chance that an alternative form of life, though not intelligent life, could exist and be detected within our Solar System is a distinct possibility.en
dc.description.sponsorshipEC/FP7/339231/EU/Habitability of Martian Environments: Exploring the Physiological and Environmental Limits of Life/HOMEen
dc.identifier.eissn2218-1997
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/12167
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-11041
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc530 Physikde
dc.subject.otherdefinition of lifeen
dc.subject.otherexoplanetsen
dc.subject.otheralien lifeen
dc.subject.otherhabitabilityen
dc.subject.otherplaneten
dc.subject.othermoonen
dc.titleThe Astrobiology of Alien Worlds: Known and Unknown Forms of Lifeen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber130en
dcterms.bibliographicCitation.doi10.3390/universe6090130en
dcterms.bibliographicCitation.issue9en
dcterms.bibliographicCitation.journaltitleUniverseen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.volume6en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften>Zentrum für Astronomie und Astrophysikde
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.instituteZentrum für Astronomie und Astrophysikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen
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