Results 41 to 50 of about 8,849 (202)
A Framework for Relative Biosignature Yields from Future Direct Imaging Missions [PDF]
, 2020 Future exoplanet direct imaging missions, such as HabEx and LUVOIR, will select target stars to maximize the number of Earth-like exoplanets that can have their atmospheric compositions characterized. Because one of these missions' aims is to detect biosignatures, they should also consider the expected biosignature yield of planets around these stars.
arxiv +1 more source
Life, 2018 The acidic sulfate-rich waters of the Meridiani Planum region were potentially a habitable environment for iron-oxidizing bacteria on ancient Mars. If life existed in this ancient martian environment, jarosite minerals precipitating in these waters may ...
Liane Loiselle +5 more
doaj +1 more source
ATLAST detector needs for direct spectroscopic biosignature characterization in the visible and near-IR [PDF]
, 2015 Are we alone? Answering this ageless question will be a major focus for astrophysics in coming decades. Our tools will include unprecedentedly large UV-Optical-IR space telescopes working with advanced coronagraphs and starshades.
Bolcar, Matthew R. +8 more
core +3 more sources
Predicting biosignatures for nutrient limited biospheres [PDF]
, 2022 With the characterisations of potentially habitable planetary atmospheres on the horizon, the search for biosignatures is set to become a major area of research in the coming decades. To understand the atmospheric characteristics that might indicate alien life we must understand the abiotic characteristics of a planet and how life interacts with its ...
arxiv +1 more source
The Role of N2 as a Geo-Biosignature for the Detection and Characterization of Earth-like Habitats [PDF]
, 2019 Since the Archean, N2 has been a major atmospheric constituent in Earth's atmosphere. Nitrogen is an essential element in the building blocks of life, therefore the geobiological nitrogen cycle is a fundamental factor in the long term evolution of both ...
Cubillos, Patricio E. +6 more
core +2 more sources
The Call for a New Definition of Biosignature [PDF]
Astrobiology, 2023 The term biosignature has become increasingly prevalent in astrobiology literature as our ability to search for life advances. Although this term has been useful to the community, its definition is not settled. Existing definitions conflict sharply over the balance of evidence needed to establish a biosignature, which leads to misunderstanding and ...
Gillen, Catherine +3 more
openaire +2 more sources
Quantifying the information impact of future searches for exoplanetary biosignatures [PDF]
Proceedings of the National Academy of Sciences Aug 2020,
202007560, 2020 One of the major goals for astronomy in the next decades is the remote search for biosignatures (i.e.\ the spectroscopic evidence of biological activity) in exoplanets. Here, we adopt a Bayesian statistical framework to discuss the implications of such future searches, both in the case when life is detected, and when no definite evidence is found.
arxiv +1 more source
Biosignatures in the solar system [PDF]
The Biochemist, 2018 Humanity's interest in whether or not we are alone in the universe spans generations, from Giordano Bruno's 16th century musings on other worlds and Giovanni Schiaparelli reporting seeing ‘canali’ in 1877 on the surface of Mars (which were thought to have been created by intelligent life) to alien invasions portrayed in today's movies.
Slade, David +3 more
openaire +3 more sources
Scientific Reports, 2021 The preservation of biosignatures on Mars is largely associated with extensive deposits of clays formed under mild early Noachian conditions (> 3.9 Ga). They were followed by widespread precipitation of acidic sulfates considered adverse for biomolecule ...
David C. Fernández-Remolar +8 more
doaj +1 more source
A Plasma 5-Marker Host Biosignature Identifies Tuberculosis in High and Low Endemic Countries
Frontiers in Immunology, 2021 Background: Several host inflammatory markers have been proposed as biomarkers for diagnosis and treatment response in Tuberculosis (TB), but few studies compare their utility in different demographic, ethnic, and TB endemic settings.Methods: Fifty-four ...
Bih H. Chendi +10 more
doaj +1 more source