Results 31 to 40 of about 18,858 (312)
The Planetary Science Journal, 2023 Low water activity limits the habitability of aqueous environments, and salts present on Mars are known to reduce water activity. As environmental brines are not pure solutions of a single salt, predicting their water activity is difficult without direct
Adam H. Stevens, Charles S. Cockell
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On the probability of habitable planets [PDF]
International Journal of Astrobiology, 2013 AbstractIn the past 15 years, astronomers have revealed that a significant fraction of the stars should harbour planets and that it is likely that terrestrial planets are abundant in our galaxy. Among these planets, how many are habitable, i.e. suitable for life and its evolution?
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Effects of Extreme Obliquity Variations on the Habitability of Exoplanets [PDF]
, 2014 We explore the impact of obliquity variations on planetary habitability in hypothetical systems with high mutual inclination. We show that large amplitude, high frequency obliquity oscillations on Earth-like exoplanets can suppress the ice-albedo ...
Armstrong, J. C. +5 more
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The Direct Mid-infrared Detectability of Habitable-zone Exoplanets around Nearby Stars
The Astronomical Journal, 2023 Giant planets within the habitable zones of the closest several stars can currently be imaged with ground-based telescopes. Within the next decade, the Extremely Large Telescopes (ELTs) will begin to image the habitable zones of a greater number of ...
Zach Werber, Kevin Wagner, Dániel Apai
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A Maximum Radius for Habitable Planets [PDF]
Origins of Life and Evolution of Biospheres, 2015 We compute the maximum radius a planet can have in order to fulfill two constraints that are likely necessary conditions for habitability: 1- surface temperature and pressure compatible with the existence of liquid water, and 2- no ice layer at the bottom of a putative global ocean, that would prevent the operation of the geologic carbon cycle to ...
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The Detection and Characterization of Extrasolar Planets
Challenges, 2014 We have now confirmed the existence of > 1800 planets orbiting stars other thanthe Sun; known as extrasolar planets or exoplanets. The different methods for detectingsuch planets are sensitive to different regions of parameter space, and so, we are ...
Ken Rice
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A Catalog of Habitable Zone Exoplanets
The Astronomical Journal, 2023 The search for habitable planets has revealed many planets that can vary greatly from an Earth analog environment. These include highly eccentric orbits, giant planets, different bulk densities, relatively active stars, and evolved stars.
Michelle L. Hill +7 more
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Habitability Properties of Circumbinary Planets [PDF]
The Astronomical Journal, 2017 Abstract It is shown that several habitability conditions (in fact, at least seven such conditions) appear to be fulfilled automatically by circumbinary planets of main-sequence stars (CBP-MS), whereas on Earth, these conditions are fulfilled only by chance.
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Survival of habitable planets in unstable planetary systems
, 2016 Many observed giant planets lie on eccentric orbits. Such orbits could be the result of strong scatterings with other giant planets. The same dynamical instability that produces these scatterings may also cause habitable planets in interior orbits to ...
Carrera, Daniel +2 more
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Planetary Dynamics and Habitable Planet Formation In Binary Star Systems
, 2009 Whether binaries can harbor potentially habitable planets depends on several factors including the physical properties and the orbital characteristics of the binary system.
A Deprit +108 more
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