The Many Faces of Astrobiology

Table of Contents

1 Preface

1.1 Used terms
1.2 Acknowledgments
1.3 Supplementary Materials

2 Aliens in Philosophy and Literature

2.1 Cosmos and life in ancient Greece
2.2 The Roman Empire and the Middle Ages.
2.3 From the Renaissance to the French Revolution.
2.4 The 19th Century
2.5 The 20th Century
2.6 The XXI Century

3 Biology and lifeforms

3.1 What is life?
3.2 Lifeforms on Earth
3.3 Vital Molecules
3.4 Reproduction and Replication
3.5 Genetic variants and mutations.
3.6 Natural Selection
3.7 The Last Universal Common Ancestor

4 Are we children of the stars?

4.1 The Birth of Stars
4.2 The Nuclear Fusion of Hydrogen
4.3 The Formation of Helium and Carbon.
4.4 Carbon Burning and Planetary Nebulae
4.5 Double Stars and Type Ia Supernovae.
4.6 Formation of Elements Beyond Carbon.
4.7 Core-Collapse Supernova Explosions
4.8 The Birth of Heavy Elements.
4.9 The Chemical Cycle of the Galaxy.
4.10 The Birth of Molecules.

5 Planetology and Origin of Planetary System

5.1 Cosmic dust
5.2 The Composition of Dust
5.3 The Formation Cycle of Grains
5.4 The Birth of the Protoplanetary Disc
5.5 Formation of Planetesimals and Protoplanets
5.6 The Age of the Earth
5.7 Meteorites
5.8 Organic Compounds in Carbonaceous Chondrites
5.9 Organic Compounds in Asteroids
5.10 Micrometeorites
5.11 Cometary Dust
5.12 Origin and Stability of Prebiotic Substances
5.13 The Formation of Atmospheres
5.14 The Geenhouse Effect
5.15 The Problem of Phosphorus and Sulfur
5.16 Origin of water on the planets

6 The Problem of the Origin: How and Where Life is Born?

6.1 The Recipe for Life
6.2 The RNA World and the Protein Interaction World.
6.3 A Special Mix.
6.4 The Development of Microorganisms.
6.5 The Primordial Environments of Life.
6.6 The Chronology of Life.
6.7 Extreme Terrestrial Environments.
6.8 Life Around Black Smokers.
6.9 Life in Underwater Hydrothermal Regions.
6.10 Life Among Ocean Clathrates.
6.11 Life in the Ice.
6.12 Life in Sulfuric Acid Caves.

7 Hunting for life in the Solar System

7.1 Venus: a Scorching Greenhouse
7.2 Mars: Earth's Sibling
7.3 Hidden Oceans
7.4 Seas of Methane

8 Hunting trace of life around other stars

8.1 The Search of Protoplanetary Disks
8.2 Searching for Exoplanets around Other Stars
8.3 Characteristics of Discovered Exoplanets
8.4 The Habitable Zone

9 Engineering of space travel and communications.

9.1 Space Travels.
9.2 The Problem of Propulsion
9.3 Exporting Life
9.4 The Lack of Gravity
9.5 The New Aliens?
9.6 The Difficult Rise of Intelligence and Encounters Between Cultures
9.7 The Drake Equation and Its Limits
9.8 The Evolution of Civilizations
9.9 Communication with Extraterrestrial Civilizations
9.10 How to Understand Each Other?
9.11 Why Travel in Space?
9.12 The SETI Paradox
9.13 The Impact of Two Civilizations

The list includes the specialized scientific publications and books consulted for the 2026 version of the book.

2 Aliens in Phylosophy and Literature

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Arrhenius, S., Worlds in the making; the evolution of the universe, 1908, Ed. New York, London, Harper, Available from: https://archive.org/details/worldsinmakingev00arrhrich ,  Access date 21/04/2026

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Burroughs, E. R. A Princess of Mars: A Barsoom Novel, 1917, Ed. Random House Worlds

Cocconi, G., Morrison, P., Searching for Interstellar Communications, 1959, Nature, 184, 844–846

Crick, F. H. C., Orgel, L.E., Directed panspermia,1973, Icarus, 19, 341-346

Darwin, C. Letter to J.D. Hooker, quoted by J.D. Bernal in The Origin of Life, Cleveland Word Publishing Company 1967

Darwin, C. On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, 1859, ED. John Murray, London, Available from: https://darwin-online.org.uk/EditorialIntroductions/Freeman_OntheOriginofSpecies.html , Access date 21/04/2026

De Fontenelle Bernard le Bovier, Entretiens sur la pluralité des mondes est un essai sur l'astronomie, 1686. Ed. Leroi, Lyon, 1800 Troisieme soir, p.17  Available from:  https://fr.wikisource.org/wiki/Entretiens_sur_la_pluralité_des_mondes  Access date 21/04/2026

Farrington, B. Storia della scienza greca, 1964, traduz. di G. Gnoli, Arnoldo Mondatori Editore

Flammarion, C. La planète Mars et ses conditions d'habitabilité, 1909, vol. 1, Ed. Paris, Gauthier-Villars, Available from: https://archive.org/details/laplantemarset01flam , Access date 21/04/2026

Galilei, G., Il Saggiatore, 1623,  Ed. Mascardi, p. 45 Available from: https://liberliber.it/autori/autori-g/galileo-galilei/il-saggiatore-mascardi/ , Access date 21/04/2026

Giordano Bruno Nolano. De L'infinito, Universo E Mondi All’illustrissimo Signor Di Mauvissiero Printed in Venice, 1634, V, p.404, Available in: https://it.wikisource.org/wiki/De_l%27infinito,_universo_e_mondi/Dialogo_quinto, Access date 21/04/2026.

Goldsmith, D., The Quest for Extraterrestrial Life: A Book of Readings, 1980, ‎ Ed. Univ Science Books, Mill Valley, California, 1-19

Hadot, P., La fine del paganesimo in: L’impero romano e l’Oriente, 1981 Storia delle religioni Vol. 4 a cura di Henri-Charles Puech, Ed. Universale Laterza,

Huygens, C., H., Kosmotheoros, The Celestial Worlds Discover'd: or, Conjectures Concerning the Inhabitants, Plants and Productions of the Worlds in the Planets, 1722 Available from: https://archive.org/details/b30537009_0001, Access date 21/04/2026

Lowell, P., Mars and its canals, 1906, Ed. New York Macmillan, Available from: https://archive.org/details/marsitscanals00loweuoft,  Access date 21/04/2026

Lucrezio Caro, T, De Rerum Natura, ca. 70 BCE, Liber II, 995 Available in: ttps://www.thelatinlibrary.com/lucretius/lucretius2.shtml, Access date 21/04/2026

Miller, S., L., A Production of Amino Acids Under Possible Primitive Earth Conditions, 1953, Science, 117, 528-529

Schiaparelli, G. V., Osservazioni astronomiche e fisiche sull'asse di rotazione e sulla topografia del pianeta Marte, 1878,  Atti della R. Accademia dei Lincei.

The New York Times, No Mars Message Yet, Marconi Radios; Ends Yacht Trip "Listening In" On Planet Today, June 16, 1922, Available from: https://timesmachine.nytimes.com/timesmachine/1922/06/16/issue.html , Access date 21/04/2026

The New York Times, Radio Listeners in Panic, Taking War Drama as Fact; October 31, 1938 Available from: https://www.nytimes.com/1938/10/31/archives/radio-listeners-in-panic-taking-war-drama-as-fact-many-flee-homes.html , Access date 21/04/2026

UNHCR, UN Refugee Agency, Global Report 2024, Available from: https://www.unhcr.org/global-trends-report-2024, Access date 21/04/2026

Voltaire, F. M. A. de, Micromegas, Chapter 2, Available from: https://people.wku.edu/nathan.love/325/Micromegas.htm  Access date 21/04/2026

Wallace, A., R., Is Mars Habitable?, 1907, Available from:  https://en.wikisource.org/wiki/Is_Mars_Habitable? , Access date 21/04/2026

Wells, H. G., The War of the Worlds 1897, Pearson's Magazine

Wickramasinghe, C. Bacterial morphologies supporting cometary panspermia: a reappraisal. International Journal of Astrobiology. 10,  25–30.

3 Biology and Lifeforms

Bar-Ona Y.M. et al., The biomass distribution on Earth, 2018, Proceedings of the National Academy of Sciences 115, 6506–6511

Bray, A.B. et al., Biologia molecolare della cellula, 1992, ed. Zanichelli

Couvier, G., Histoire des progrès des sciences naturelles, depuis 1789 jusqu'a ce jour. 1837, Ed. Société belge de librairie https://preserver.beic.it/delivery/DeliveryManagerServlet?dps_pid=IE1431878

Darwin, C., On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, 1859, ED. John Murray, London

De Duve, C., Singularity Landmarks on the Pathways of Life, 2005, Ed. Cambridge University Press

Jean-Baptiste Lamarck, J-B., Philosophie zoologique, 1809, Ed. National Museum of Natural History, France

Kolb, V.M. On the applicability of the Aristotelian principles to the definition of life, 2007, International Journal of Astrobiology, 6, 51–57

Lyell, C., Principles of geology, being an inquiry how far the former changes of the earth's surface are referable to causes now in operation, 1837, Ed. James Kay Jr. & Brothers, Available from: https://archive.org/details/principlesofgeol02lyel/page/358/mode/2up?ref=ol , Access date 21/04/2026

Malthus , T., An Essay on the Principle of Population, as it Affects the Future Improvement of Society with Remarks on the Speculations of Mr. Godwin, M. Condorcet, and Other Writers. 1798, Printed for J. Johnson, in St. Paul’s Church-Yard

Pennisi, E., Algae suggest eukaryotes get many gifts of bacteria DNA, 2019, Science 363, 439,

Rizzotti, M. (eds.) et al., Defining Life, 1996, Padova University Press

Shu, F., The Physical Universe, 1982, ed. Universe Science Books,  491-544

Wallace, A. R., Human Selection, 1890, Alfred Russel Wallace Classic Writings. Paper 5. Available from: http://digitalcommons.wku.edu/dlps_fac_arw/5

4  Are we children of the Stars?

Ehrenfreund, P., Cami, J., Cosmic Carbon Chemistry: From the Interstellar Medium to the Early Earth, 2010, Perspective in Biology, Cold Spring Harbor Laboratory Press

Ehrenfreund, P., Sephtonb,M.A.,  Carbon molecules in space: from astrochemistry to astrobiology, 2006, Journal of the Royal Society of Chemistry, 133, 277

Fraser, H.J.  et al., 2002, Astrochemistry : The molecular universe, Astronomy and Geophysics 43, 2. 10, Oxford Academics

Galletta, G. Lezioni di Astronomia per Scienze Naturali, 2021, Lectures 16-20, University of Padua

Galletta, G., Astrobiologia, 2021, Ed. Padova Univ. Press

Galletta, G., Lectures of Astrophysics of Galaxies, 2017, Sections 6-8, University of Padua

Jet Propulsion Laboratory, Catalog of  Molecular Spectroscopy, California Institute of Technology, Available from: https://spec.jpl.nasa.gov/ftp/pub/catalog/catform.html , Access 21/4/2026

Lovas, F. J.; Dragoset, R. A., NIST Recommended Rest Frequencies for Observed Interstellar Molecular Microwave Transitions, 2004, Journal of Physical and Chemical Reference Data. 33, 1-177.

Omukai, K., Protostellar Collapse with Various Metallicities, 2000, Astrophysical Journal 534, 809,

Salaris, M. Weiss, A., Homogeneous age dating of 55 Galactic globular clusters. Clues to the Galaxy formation mechanisms, 2002, Astronomy and Astrophysics, 338, 492, EDP Science, https://doi.org/10.1051/0004-6361:20020554

Sit, M. Ness, The age distribution of stars in the Milky Way bulge, 2020, Astrophysical Journal 900, 4

Virtual Atomic and Molecular Data Center, Cologne Database for Molecular Spectroscopy, Univ. of Cologne, Available from: https://cdms.astro.uni-koeln.de/cdms/portal/ , Access 21/4/2026

5 Planetology and the Origin of Planetary Systems

Callahan, M. P. et al. Carbonaceous meteorites contain a wide range of extraterrestrial nucleobases, 2011, Proc. Natl Acad. Sci. USA 108, 13995–13998

Chan, Q.H.S., et al., Organic matter and water from asteroid Itokawa, 2021. Sci Rep 11, 5125.

Cronin, J. R., Pizzarello, S., Yuen, G.U., Amino acids of the Murchison meteorite: II. Five carbon acyclic primary β-, γ, and δ-amino alkanoic acids, 1985, Geochimica et Cosmochimica Acta, 49, 2259-2265

Ehrenfreund, P. et al., Extraterrestrial amino acids in Orgueil and Ivuna: Tracing the parent body of CI type carbonaceous chondrites, 2001, Proceedings of the National Academy of Sciences. 98, 2138.

Galletta, G. Lezioni di Astronomia per Scienze Naturali, 2021, Lectures 4,6-7, University of Padua

Galletta, G., Lectures of Astrophysics of Galaxies, 2017, Lecture 7, University of Padua

Heck,  P. R.  et al., Lifetimes of interstellar dust from presolar silicon carbide cosmic-ray exposure ages, 2020,Proceedings of the National Academy of Sciences 117, 1884

IAU,  Definition of a Planet in the Solar System, 2006, Resolution B5, Available from:  https://www.iau.org/IAU/Iau/Publications/List-of-Resolutions.aspx

Koga, T., et al., A complete set of canonical nucleobases in the carbonaceous asteroid (162173) Ryugu,  2026, Nature Astronomy, Available from:  https://www.nature.com/articles/s41550-026-02791-z

Micca Longo, G., et al., Evaluation of CaSO4 micrograins in the context of organic matter delivery: thermochemistry and atmospheric entry, 2018,International Journal of Astrobiology, 1, Cambridge University Press,

Micca Longo, G., Longo, S., The role of primordial atmosphere composition in organic matter delivery to early Earth, 2020, Rendiconti Lincei. Scienze Fisiche e Naturali, 31, 53, Springer

Mojarro, A.,  et al., Prebiotic organic compounds in samples of asteroid Bennu indicate heterogeneous aqueous alteration, 2025, PNAS, 122, 49, e2512461122

Nakamura, E. et al., Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft, 2012, Proceedings of the National Academy of Sciences 109, E624, www.pnas.org/cgi/doi/10.1073/pnas.111623610

Oba Y., et al., Nucleobase synthesis in interstellar ices, 2019, Nature Communication, 10, 4413

Potiszil, C., et al., The Albedo of Ryugu: Evidence for a High Organic Abundance, as Inferred from the Hayabusa2 Touchdown Maneuver, 2020, Astrobiology, 20, 916, Mary Ann Liebert, Inc., https://doi.org/10.1089/ast.2019.2198

Raymond, S.N., Morbidelli, A., The Grand Tack model: a critical review, 2014, in: Complex Planetary Systems, Proceedings IAU Symposium No. 310, ed. Z. Knezevic & A. Lemaître,

Rietmeijer, F. J. M., Interrelationships among meteoric metals, meteors, interplanetary dust, micrometeorites, and meteorites, 2000, Meteoritics & Planetary Science, 35, 1025-1041.

Saladino, R. et al., Meteorite-catalyzed syntheses of nucleosides and of other prebiotic compounds from formamide under proton irradiation, 2015, Proceedings of the National Academy of Sciences 112, 2746,

Selsis, F., Evaporation planètaire, Formation planétaire et exoplanètes, 2005, Ed. Halbwachs, Egret, Hameury, p.272, Ecole CNRS de Goutelas XXVIII

Terquem, C. E., Migration des planètes, Formation planétaire et exoplanètes, 2005, Ed. Halbwachs, Egret, Hameury, p.132, Ecole CNRS de Goutelas XXVIII

6 Origin of life

Achberger AM, et al., Expression and partial characterization of an ice-binding protein from a bacterium isolated at a depth of 3,519 m in the vostok ice core, Antarctica, 2011, Frontiers Microbiology, 2, 255

Becraft, E.D., et al., Evolutionary stasis of a deep subsurface microbial lineage, 2021, The ISME Journal, 15, 2830–2842

Cavalazzi, B., et al., Cellular remains in a ~3.42-billion-year-old subseafloor hydrothermal environment, 2021, Science Advances, 7, 3963

Chivian, D., et al., Environmental Genomics Reveals a Single-Species Ecosystem Deep Within Earth, 2008, Science, 322, 275

Dance, A., Is this RNA a key ingredient in the origin of life?, 2023 Nature,| 615, 22

Dodd, M., S., et al., Evidence for early life in Earth’s oldest hydrothermal vent precipitates, 2017, Nature, 543, 60

Dworkin, J. P., et al., The roads to and from the RNA world, 2023, Journal of Theorethical Biology, 222(1), 127

Hirao, I, Ellington, A. D., Re-creating the RNA world, 1995, Current Biology 5, 9

Katsnelson, A., How did life get multicellular? Five simple organisms could have the answer, 2025, Nature, 644, 856

Lyons, T. W., et al., Co-evolution of early Earth environments and microbial life, 2024, Nature Reviews Microbiology, 22, 572

Marshall, M., Mystery bug found in Antarctica’s Lake Vostok, 2013, New Scientist, 217, 8.

Matsuo, M., Kurihara, K., Proliferating coacervate droplets as the missing link between chemistry and biology in the origins of life, 2021, Nature Communications, 12, 5487

Moody, E. R. R., The nature of the last universal common ancestor and its impact on the early Earth system, 2024, Nature Ecology & Evolution, 8, 1654

Morono, Y., et al., Aerobic microbial life persists in oxic marine sediment as old as 101.5 million years, 2020, Nature Communications, 11, 3626

Orgel, L. E., Prebiotic chemistry and the origin of the RNA world, 2004, Critical Reviews in Biochemistry and Molecular Biology, 39, 99

Schopf, W., et al., Earliest evidence of life on earth, 2007, Precambrian Research 158, 139

Sleep, N. H., Geological and Geochemical Constraints on the Origin and Evolution of Life, 2018, Astrobiology 18, 1199.

Suzuki, Y., et al., Subsurface Microbial Colonization at Mineral-Filled Veins in 2.05-Billion-Year-Old Mafic Rock from the Bushveld Igneous Complex, South Africa, 2024, Microbial Ecology, 87, 116

Tashiro T. et al., Early trace of life from 3.95 Ga sedimentary rocks in Labrador, Canada, 2017, Nature 549, 516

7 Hunting for life in the Solar System

Atreya, S. K., 2007, The Mystery of Methane on Mars and Titan, Scientific American, 42 https://www.scientificamerican.com/article/methane-on-mars-titan/

Bains, W., et al., Venus’ Atmospheric Chemistry and Cloud Characteristics Are Compatible with Venusian Life, 2024, Astrobiology, 24, 371

Burgess, E., Shades of Van Leeuwenhoek, 1978 in: To the Red Planet, New Yor: Columbia University Press, p.115-129

Damer, B., Deamer, D., The Hot Spring Hypothesis for an Origin of Life, 2020, Astrobiology, 20, 1

Enya, K., et al., A Comparative Study of Methods for Detecting Extraterrestrial Life in Exploration Missions to Mars and the Solar System II: Targeted Characteristics, Detection Techniques, and Their Combination for Survey, Detection, and Analysis, 2023, Astrobiology 23, 1099

Greenberg, R., 2002, Tides and the Biosphere of Europa, American Scientist, 90, 48

Hurowitz, J.A., et al., Redox-driven mineral and organic associations in Jezero Crater, Mars, 2025, Nature, 645, 332

Kahana, A., Enceladus: First Observed Primordial Soup Could Arbitrate Origin-of-Life Debate, 2019, Astrobiology, 19, 1

Kotsyurbenko, O. R., et al. Different Scenarios for the Origin and the Subsequent Succession of a Hypothetical Microbial Community in the Cloud Layer of Venus, 2024, Astrobiology 24, 423

Lauro, S. E., et al., Multiple subglacial water bodies below the south pole of Mars unveiled by new MARSIS data, 2020, Nature Astronomy, Available from: https://doi.org/10.1038/s41550-020-1200-6

Levin, G., V., Straat, P. A., The Case for Extant Life on Mars and Its Possible Detection by the Viking Labeled Release Experiment, 2016, Astrobiology, 16, 798

Nazari-Sharabian, M. et al., 2020, Water on Mars—A Literature Review, Galaxies 8, 40, MDPI, https://doi.org/10.3390/galaxies8020040

Miller, A.Z., et al., The Microbial Inhabitants of the Corona Lava Tube: Astrobiological Insights from a Mars Analog Environment, 2026, Astrobiology 26, 30

Mitchell, K. L., et al., A proposed model for cryovolcanic activity on Enceladus driven by volatile exsolution, 2024, Journal of Geophysical Research: Planets, 129, e2023JE007977

Mráziková, K., et al., A Novel Abiotic Pathway for Phosphine Synthesis over Acidic Dust in Venus’ Atmosphere, 2024, Astrobiology 24, 407

Petkowski, J. J., et al. Astrobiological Potential of Venus Atmosphere Chemical Anomalies and Other Unexplained Cloud Properties, 2024, Astrobiology, 24, 343

Russell, M.J., et al., The Possible Emergence of Life and Differentiation of a Shallow Biosphere on Irradiated Icy Worlds: The Example of Europa, 2017, Astrobiology, 17, 1265

Russell, M.J., The Possible Emergence of Life and Differentiation of a Shallow Biosphere on Irradiated Icy Worlds: The Example of Europa, Astrobiology, 17, 1265

Scheller, E. L., et al., Long-term drying of Mars by sequestration of ocean-scale volumes of water in the crust, 2021, Science, 10, 1126

Seager, S., The Venusian Lower Atmosphere Haze as a Depot for Desiccated Microbial Life: A Proposed Life Cycle for Persistence of the Venusian Aerial Biosphere, 2021, Astrobiology, 21, 1206

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8 Hunting trace of life around other stars.

Alain Lecavelier des Etangs, A., et al., Exocomets size distribution in the Beta Pictoris planetary system, 2022, Nature 12, 5855

Arnoldi, L., et al., A test for the search for life on extrasolar planets Looking for the terrestrial vegetation signature in the Earthshine spectrum? 2002, A&A 392, 231

Burn, R., et al., A radius valley between migrated steam worlds and evaporated rocky cores, 2024, Nature Astronomy, 8. 463

Covone,C., et al., Efficiency of the oxygenic photosynthesis on Earth-like planets in the habitable zone, 2021, MNRAS, 505, 3329

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DasSarma S, Schwieterman, EW, Early evolution of purple retinal pigments on Earth and implications for exoplanet biosignatures. 2021, International Journal of Astrobiology 20, 241

de Wit, J., et al., A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c, 2016, Nature, 537, 69

Jeffers, S. V., et al., 2020, A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887, Science 368, 1477

Kiang, N. Y., et al., Spectral Signatures of Photosynthesis. I. Review of Earth Organisms, 2007, Astrobiology, 7, 222

Kiang, N. Y., et al., Spectral Signatures of Photosynthesis. II. Coevolution with Other Stars and the Atmosphere on Extrasolar Worlds, 2007, Astrobiology, 7, 231

MacGregor, M. A., et al., Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through Far-ultraviolet Observations, 2021, The Astrophysical Journal Letters, 911, L25

Miret-Roig, N., A rich population of free-floating planets in the Upper Scorpius young stellar association, 2022, Nature Astronomy, 6, 89

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Schwieterman,E. W., Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life, 2018, Astrobiology, 18, 663

Southworth, J., et al., Detection of the Atmosphere of the 1.6 M_⊕ Exoplanet GJ 1132 b, 2017, The Astronomical Journal, 153:191

9 Engineering of space traveling and communications

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Emery, N. J., Clayton, N.S., The Mentality of Crows: Convergent Evolution of Intelligence in Corvids and Apes, 2004, Science, 306, 1903

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Galletta, G., Sergi, V., Astrobiologia: le frontiere della vita, 2005, ed. Hoepli

Glavin, D.P, et al., Biological contamination studies of lunar landing sites: implications for future planetary protection and life detection on the Moon and Mars, 2004, International Journal of Astrobiology, 3, 265

Goodwin, T. J., Christofidou-Solomidou, M., Oxidative Stress and Space Biology: An Organ-Based Approach, 2018, International Journal of Molecular Sciences, 19, 959

Haines, G. K., CIA's Role in the Study of UFOs, 1947-90, p.67, Available from: https://www.cia.gov/resources/csi/static/cia-role-study-UFOs.pdf

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Kavita J. Rangan, H. J., Reck-Peterson, S. L., RNA recoding in cephalopods tailors microtubule motor protein function, 2023, Cell, 186, 2531

Kwon JY, et al., How Will We React to the Discovery of Extraterrestrial Life?, 2018, Front. Psychol. 8:2308.

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Nie1, H., et al., Exploring plant responses to altered gravity for advancing space agriculture, 2025, Plant Communications, 6, 101370

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Ozaki, K, Reinhard, C. T., The future lifespan of Earth’s oxygenated atmosphere, 2021, Nature Geoscience, 14, 138

Poulet, L., et al. , A Physical Modeling Approach for Higher Plant Growth in Reduced Gravity Environments, 2018, Astrobiology, 18, 1093

Ramirez, R., et al., New numerical determination of habitability in the Galaxy: the SETI connection, 2018, International Journal of Astrobiology, 17, 34

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