Results 61 to 70 of about 29,391 (220)

Astrobiological Effects of F, G, K and M Main-Sequence Stars

, 2008
We focus on the astrobiological effects of photospheric radiation produced by main-sequence stars of spectral types F, G, K, and M. The photospheric radiation is represented by using realistic spectra, taking into account millions or hundred of millions ...
E. F. Guinan, Goldsmith, L. Gurdemir, M. Cuntz, R. L. Kurucz   +4 more
core   +1 more source

Chlorine on the Surface, Chlorine in the Air, What Is the New Global View of the Martian Chlorine Cycle?

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Atmospheric hydrogen chloride (HCl, or hydrochloric acid) has strong links to volcanic activity on Earth. If it is present in the atmosphere of Mars, it could hint at active magmatic processes, or the outgassing from the remnants of recently dormant volcanoes.
K. S. Olsen
wiley   +1 more source

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

Earth System Model Analysis of How Astronomical Forcing Is Imprinted Onto the Marine Geological Record: The Role of the Marine Organic Carbon Cycle and Feedbacks

Paleoceanography and Paleoclimatology, Volume 41, Issue 1, January 2026.
Abstract Eccentricity cycles in deep‐sea paleoclimate records suggest that astronomical forcing notably altered global temperatures and carbon cycle dynamics. Because changes in the distribution of insolation alone cannot explain the observed climate variability, climate‐carbon cycle feedbacks must have amplified the response.
P. Vervoort, S. Kirtland Turner, D. Hülse, Sarah E. Greene, A. Ridgwell   +4 more
wiley   +1 more source

Viability and Motility of Escherichia coli Under Elevated Martian Salt Stresses

Life
This 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, Berke Santos, Sherif Al-Morssy Youssef, Dirk Schulze-Makuch   +3 more
doaj   +1 more source

A New Record for Microbial Perchlorate Tolerance: Fungal Growth in NaClO₄ Brines and its Implications for Putative Life on Mars

Life, 2020
The habitability of Mars is strongly dependent on the availability of liquid water, which is essential for life as we know it. One of the few places where liquid water might be found on Mars is in liquid perchlorate brines that could form via ...
Jacob Heinz, Tim Krahn, Dirk Schulze-Makuch   +2 more
doaj   +1 more source

Variations in climate habitability parameters and their effect on Earth's biosphere during the Phanerozoic Eon

Scientific Reports, 2023
Essential insights on the characterization and quality of a detectable biosphere are gained by analyzing the effects of its environmental parameters. We compiled environmental and biological properties of the Phanerozoic Eon from various published data ...
Iva Vilović, Dirk Schulze-Makuch, René Heller   +2 more
doaj   +1 more source

Mineral Weathering Experiments for Terrestrial Planetary Analogs in a Continuous‐Flow Reactor

Geofluids, Volume 2026, Issue 1, 2026.
Understanding the groundwater environments for ancient Mars and other terrestrial bodies is of great interest for evaluating their habitability. Here, we experimentally tested simulated aqueous alterations of two Mars simulants (variants of MGS‐1) using a continuous‐flow packed bed reactor, reacting with three ionic simulated groundwater analog ...
Jessica M. Weber, Eduardo Martinez, Rachel Y. Sheppard, Laura E. Rodriguez, Aaron Celestian, Bronwyn L. Teece, Laura M. Barge, Pramita Mishra   +7 more
wiley   +1 more source

Microbial preference for chlorate over perchlorate under simulated shallow subsurface Mars-like conditions

Scientific Reports
The Martian surface and shallow subsurface lacks stable liquid water, yet hygroscopic salts in the regolith may enable the transient formation of liquid brines.
Florian Carlo Fischer, Dirk Schulze-Makuch, Jacob Heinz   +2 more
doaj   +1 more source

NASA Research and Analysis: Status, Issues, and Recommendations for the Planetary Science and Astrobiology Decadal Survey Committee [PDF]

, 2021
Julie Castillo‐Rogez, M. Sykes, Amanda Hendrix, J. A. Rathbun, Christina Richey, P. K. Byrne   +5 more
openalex   +1 more source