Results 61 to 70 of about 27,462 (193)
Dependence of Biological Activity on the Surface Water Fraction of Planets
, 2019 One of the unique features associated with the Earth is that the fraction of its surface covered by land is comparable to that spanned by its oceans and other water bodies.
Lingam, Manasvi, Loeb, Abraham
core +1 more source
Nature Communications, 2017 The influence of tectonics, continental weathering, and seafloor weathering in the geological carbon cycle remain unclear. Here, the authors develop a new carbon cycle model and, through comparison with proxy data, critically evaluate the influence of ...
Joshua Krissansen-Totton +1 more
doaj +1 more source
A philosophical outlook on potential conflicts between planetary protection, astrobiology and commercial use of space [PDF]
, 2019 The aim of this chapter is to use philosophy and, in particular ethical theory, to identify and explore some potential ...
Persson, Erik
core
Is the Pale Blue Dot unique? Optimized photometric bands for identifying Earth-like exoplanets
, 2016 The next generation of ground and space-based telescopes will image habitable planets around nearby stars. A growing literature describes how to characterize such planets with spectroscopy, but less consideration has been given to the usefulness of ...
Arney, Giada +6 more
core +1 more source
Valuing life detection missions
, 2018 Recent discoveries imply that Early Mars was habitable for life-as-we-know-it; that Enceladus might be habitable; and that many stars have Earth-sized exoplanets whose insolation favors surface liquid water. These exciting discoveries make it more likely
Gaidos, Eric +2 more
core +1 more source
Maximum Lifetime of the Vegetative Biosphere
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 11, 16 June 2026.Abstract We use a three‐dimensional model to calculate steady‐state climates at various intervals in Earth's future, across a parameter space of increasing insolation and decreasing CO2 ${\text{CO}}_{2}$ mixing ratio. Comparison with prior results shows an overestimation of warming by one‐dimensional models when solar constant is increased and CO2 ...
Jacob Haqq‐Misra, Eric Wolf
wiley +1 more source
Numerical Testing of The Rare Earth Hypothesis using Monte Carlo Realisation Techniques
, 2010 The Search for Extraterrestrial Intelligence (SETI) has thus far failed to provide a convincing detection of intelligent life. In the wake of this null signal, many "contact pessimistic" hypotheses have been formulated, the most famous of which is the ...
Annis +14 more
core +1 more source
Widespread Impact‐Induced Crustal Permeability on the Early Earth
AGU Advances, Volume 7, Issue 3, June 2026.Abstract The early Earth (i.e., Archean and Hadean Eons, 2.5–4.0 and 4.0–4.5 Ga, respectively) experienced frequent cosmic bombardment. Impacts have been shown to stimulate crustal alteration, for instance via hydrothermal systems active for up to millions of years post‐impact.
A. M. Alexander +2 more
wiley +1 more source
Galactic Punctuated Equilibrium: How to Undermine Carter's Anthropic Argument in Astrobiology
, 2009 We investigate a new strategy which can defeat the (in)famous Carter's "anthropic" argument against extraterrestrial life and intelligence. In contrast to those already considered by Wilson, Livio, and others, the present approach is based on relaxing ...
Annis J. +6 more
core +1 more source
Viability and Motility of Escherichia coli Under Elevated Martian Salt Stresses
LifeThis study investigates the effects of three Martian-relevant salts—sodium chlorate, sodium perchlorate, and sodium chloride—on the viability and motility of Escherichia coli, a model organism for understanding microbial responses to environmental stress.
Max Riekeles +3 more
doaj +1 more source