Astrobiology最新文献_第7页

Astrobiological Potential of Venus Atmosphere Chemical Anomalies and Other Unexplained Cloud Properties. 金星大气化学异常及其他无法解释的云层特性的天体生物学潜力。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-04-01 Epub Date: 2024-03-07 DOI: 10.1089/ast.2022.0060

Janusz J Petkowski, Sara Seager, David H Grinspoon, William Bains, Sukrit Ranjan, Paul B Rimmer, Weston P Buchanan, Rachana Agrawal, Rakesh Mogul, Christopher E Carr

引用次数: 0

Venus' Atmospheric Chemistry and Cloud Characteristics Are Compatible with Venusian Life. 金星大气化学成分和云层特征与金星生命相适应

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-04-01 Epub Date: 2023-06-12 DOI: 10.1089/ast.2022.0113

William Bains, Janusz J Petkowski, Sara Seager

{"title":"Venus' Atmospheric Chemistry and Cloud Characteristics Are Compatible with Venusian Life.","authors":"William Bains, Janusz J Petkowski, Sara Seager","doi":"10.1089/ast.2022.0113","DOIUrl":"10.1089/ast.2022.0113","url":null,"abstract":"Venus is Earth's sister planet, with similar mass and density but an uninhabitably hot surface, an atmosphere with a water activity 50-100 times lower than anywhere on Earths' surface, and clouds believed to be made of concentrated sulfuric acid. These features have been taken to imply that the chances of finding life on Venus are vanishingly small, with several authors describing Venus' clouds as \"uninhabitable,\" and that apparent signs of life there must therefore be abiotic, or artefactual. In this article, we argue that although many features of Venus can rule out the possibility that Earth life could live there, none rule out the possibility of all life based on what we know of the physical principle of life on Earth. Specifically, there is abundant energy, the energy requirements for retaining water and capturing hydrogen atoms to build biomass are not excessive, defenses against sulfuric acid are conceivable and have terrestrial precedent, and the speculative possibility that life uses concentrated sulfuric acid as a solvent instead of water remains. Metals are likely to be available in limited supply, and the radiation environment is benign. The clouds can support a biomass that could readily be detectable by future astrobiology-focused space missions from its impact on the atmosphere. Although we consider the prospects for finding life on Venus to be speculative, they are not absent. The scientific reward from finding life in such an un-Earthlike environment justifies considering how observations and missions should be designed to be capable of detecting life if it is there.","PeriodicalId":8645,"journal":{"name":"Astrobiology","volume":" ","pages":"371-385"},"PeriodicalIF":4.2,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9618160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Different Scenarios for the Origin and the Subsequent Succession of a Hypothetical Microbial Community in the Cloud Layer of Venus. 金星云层中假想微生物群落的起源和后续演化的不同情景。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-04-01 Epub Date: 2024-04-02 DOI: 10.1089/ast.2022.0117

Oleg R Kotsyurbenko, Vladimir N Kompanichenko, Anatoli V Brouchkov, Yuliya Y Khrunyk, Sergey P Karlov, Vladimir V Sorokin, Dmitry A Skladnev

{"title":"Different Scenarios for the Origin and the Subsequent Succession of a Hypothetical Microbial Community in the Cloud Layer of Venus.","authors":"Oleg R Kotsyurbenko, Vladimir N Kompanichenko, Anatoli V Brouchkov, Yuliya Y Khrunyk, Sergey P Karlov, Vladimir V Sorokin, Dmitry A Skladnev","doi":"10.1089/ast.2022.0117","DOIUrl":"10.1089/ast.2022.0117","url":null,"abstract":"The possible existence of a microbial community in the venusian clouds is one of the most intriguing hypotheses in modern astrobiology. Such a community must be characterized by a high survivability potential under severe environmental conditions, the most extreme of which are very low pH levels and water activity. Considering different scenarios for the origin of life and geological history of our planet, a few of these scenarios are discussed in the context of the origin of hypothetical microbial life within the venusian cloud layer. The existence of liquid water on the surface of ancient Venus is one of the key outstanding questions influencing this possibility. We link the inherent attributes of microbial life as we know it that favor the persistence of life in such an environment and review the possible scenarios of life's origin and its evolution under a strong greenhouse effect and loss of water on Venus. We also propose a roadmap and describe a novel methodological approach for astrobiological research in the framework of future missions to Venus with the intent to reveal whether life exists today on the planet.","PeriodicalId":8645,"journal":{"name":"Astrobiology","volume":" ","pages":"423-441"},"PeriodicalIF":4.2,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140334584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detectability of Surface Biosignatures for Directly Imaged Rocky Exoplanets. 直接成像岩质系外行星表面生物特征的可探测性。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-03-01 Epub Date: 2024-02-19 DOI: 10.1089/ast.2023.0099

Schuyler R Borges, Gabrielle G Jones, Tyler D Robinson

{"title":"Detectability of Surface Biosignatures for Directly Imaged Rocky Exoplanets.","authors":"Schuyler R Borges, Gabrielle G Jones, Tyler D Robinson","doi":"10.1089/ast.2023.0099","DOIUrl":"10.1089/ast.2023.0099","url":null,"abstract":"Modeling the detection of life has never been more opportune. With next-generation space telescopes, such as the currently developing Habitable Worlds Observatory (HWO) concept, we will begin to characterize rocky exoplanets potentially similar to Earth. However, few realistic planetary spectra containing surface biosignatures have been paired with direct imaging telescope instrument models. Therefore, we use a HWO instrument noise model to assess the detection of surface biosignatures affiliated with oxygenic, anoxygenic, and nonphotosynthetic extremophiles. We pair the HWO telescope model to a one-dimensional radiative transfer model to estimate the required exposure times necessary for detecting each biosignature on planets with global microbial coverage and varying atmospheric water vapor concentrations. For modeled planets with 0-50% cloud coverage, we determine pigments and the red edge could be detected within 1000 hr (100 hr) at distances within 15 pc (11 pc). However, tighter telescope inner working angles (2.5 λ/D) would allow surface biosignature detection at further distances. Anoxygenic photosynthetic biosignatures could also be more easily detectable than nonphotosynthetic pigments and the photosynthetic red edge when compared against a false positive iron oxide slope. Future life detection missions should evaluate the influence of false positives on the detection of multiple surface biosignatures.","PeriodicalId":8645,"journal":{"name":"Astrobiology","volume":" ","pages":"283-299"},"PeriodicalIF":4.2,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139911952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chapter 9: Life as We Don't Know It. 第 9 章：我们不知道的生活。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-03-01 DOI: 10.1089/ast.2021.0103

Natalie Grefenstette, Luoth Chou, Stephanie Colón-Santos, Theresa M Fisher, Veronica Mierzejewski, Ceren Nural, Pritvik Sinhadc, Monica Vidaurri, Lena Vincent, Maggie Meiqi Weng

{"title":"Chapter 9: Life as We Don't Know It.","authors":"Natalie Grefenstette, Luoth Chou, Stephanie Colón-Santos, Theresa M Fisher, Veronica Mierzejewski, Ceren Nural, Pritvik Sinhadc, Monica Vidaurri, Lena Vincent, Maggie Meiqi Weng","doi":"10.1089/ast.2021.0103","DOIUrl":"10.1089/ast.2021.0103","url":null,"abstract":"While Earth contains the only known example of life in the universe, it is possible that life elsewhere is fundamentally different from what we are familiar with. There is an increased recognition in the astrobiology community that the search for life should steer away from terran-specific biosignatures to those that are more inclusive to all life-forms. To start exploring the space of possibilities that life could occupy, we can try to dissociate life from the chemistry that composes it on Earth by envisioning how different life elsewhere could be in composition, lifestyle, medium, and form, and by exploring how the general principles that govern living systems on Earth might be found in different forms and environments across the Solar System. Exotic life-forms could exist on Mars or Venus, or icy moons like Europa and Enceladus, or even as a shadow biosphere on Earth. New perspectives on agnostic biosignature detection have also begun to emerge, allowing for a broader and more inclusive approach to seeking exotic life with unknown chemistry that is distinct from life as we know it on Earth.","PeriodicalId":8645,"journal":{"name":"Astrobiology","volume":"24 S1","pages":"S186-S201"},"PeriodicalIF":4.2,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140157507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chapter 5: Major Biological Innovations in the History of Life on Earth. 第 5 章：地球生命史上的重大生物创新。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-03-01 DOI: 10.1089/ast.2021.0119

G Ozan Bozdag, Nadia Szeinbaum, Peter L Conlin, Kimberly Chen, Santiago Mestre Fos, Amanda Garcia, Petar I Penev, George A Schaible, Gareth Trubl

{"title":"Chapter 5: Major Biological Innovations in the History of Life on Earth.","authors":"G Ozan Bozdag, Nadia Szeinbaum, Peter L Conlin, Kimberly Chen, Santiago Mestre Fos, Amanda Garcia, Petar I Penev, George A Schaible, Gareth Trubl","doi":"10.1089/ast.2021.0119","DOIUrl":"10.1089/ast.2021.0119","url":null,"abstract":"All organisms living on Earth descended from a single, common ancestral population of cells, known as LUCA-the last universal common ancestor. Since its emergence, the diversity and complexity of life have increased dramatically. This chapter focuses on four key biological innovations throughout Earth's history that had a significant impact on the expansion of phylogenetic diversity, organismal complexity, and ecospace habitation. First is the emergence of the last universal common ancestor, LUCA, which laid the foundation for all life-forms on Earth. Second is the evolution of oxygenic photosynthesis, which resulted in global geochemical and biological transformations. Third is the appearance of a new type of cell-the eukaryotic cell-which led to the origin of a new domain of life and the basis for complex multicellularity. Fourth is the multiple independent origins of multicellularity, resulting in the emergence of a new level of complex individuality. A discussion of these four key events will improve our understanding of the intertwined history of our planet and its inhabitants and better inform the extent to which we can expect life at different degrees of diversity and complexity elsewhere.","PeriodicalId":8645,"journal":{"name":"Astrobiology","volume":"24 S1","pages":"S107-S123"},"PeriodicalIF":4.2,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11071111/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140157503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to: Astrobiology 2023;23(12):1303-1336. Correction to：Astrobiology 2023;23(12):1303-1336.

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-03-01 DOI: 10.1089/ast.2022.0133.correx

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Chapter 4: A Geological and Chemical Context for the Origins of Life on Early Earth. 第 4 章：早期地球生命起源的地质和化学背景。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-03-01 DOI: 10.1089/ast.2021.0139

Laura E Rodriguez, Thiago Altair, Ninos Y Hermis, Tony Z Jia, Tyler P Roche, Luke H Steller, Jessica M Weber

引用次数: 0

Chapter 8: Searching for Life Beyond Earth. 第 8 章：寻找地球之外的生命。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-03-01 DOI: 10.1089/ast.2021.0104

Luoth Chou, Natalie Grefenstette, Schuyler Borges, Tristan Caro, Enrico Catalano, Chester E Harman, Jordan McKaig, Chinmayee Govinda Raj, Gareth Trubl, Amber Young

{"title":"Chapter 8: Searching for Life Beyond Earth.","authors":"Luoth Chou, Natalie Grefenstette, Schuyler Borges, Tristan Caro, Enrico Catalano, Chester E Harman, Jordan McKaig, Chinmayee Govinda Raj, Gareth Trubl, Amber Young","doi":"10.1089/ast.2021.0104","DOIUrl":"10.1089/ast.2021.0104","url":null,"abstract":"The search for life beyond Earth necessitates a rigorous and comprehensive examination of biosignatures, the types of observable imprints that life produces. These imprints and our ability to detect them with advanced instrumentation hold the key to our understanding of the presence and abundance of life in the universe. Biosignatures are the chemical or physical features associated with past or present life and may include the distribution of elements and molecules, alone or in combination, as well as changes in structural components or physical processes that would be distinct from an abiotic background. The scientific and technical strategies used to search for life on other planets include those that can be conducted in situ to planetary bodies and those that could be observed remotely. This chapter discusses numerous strategies that can be employed to look for biosignatures directly on other planetary bodies using robotic exploration including those that have been deployed to other planetary bodies, are currently being developed for flight, or will become a critical technology on future missions. Search strategies for remote observations using current and planned ground-based and space-based telescopes are also described. Evidence from spectral absorption, emission, or transmission features can be used to search for remote biosignatures and technosignatures. Improving our understanding of biosignatures, their production, transformation, and preservation on Earth can enhance our search efforts to detect life on other planets.","PeriodicalId":8645,"journal":{"name":"Astrobiology","volume":"24 S1","pages":"S164-S185"},"PeriodicalIF":4.2,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140157506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Foreword to the Astrobiology Primer 3.0. 天体生物学入门 3.0》前言。

IF 4.2 3区物理与天体物理

Astrobiology Pub Date : 2024-03-01 DOI: 10.1089/ast.2023.0116

Lucas Mix

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