Results 81 to 90 of about 11,414 (233)

Phase Boundaries Among Three Hydrous Ferric Sulfates and Their Implications for Mars

Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract Ferric sulfate minerals have been identified by orbital and landed missions at multiple locations on Mars and are the most common minerals in the Acid Mine Drainage (AMD) system on Earth. The occurrences and the speciation of ferric sulfates are very sensitive to variations in environmental conditions, such as temperature (T), relative ...
Erbin Shi, Alian Wang, I‐Ming Chou, Zongcheng Ling   +3 more
wiley   +1 more source

Fingerprinting Non-Terran Biosignatures [PDF]

Astrobiology, 2018
Most strategies for life detection rely upon finding features known to be associated with terran life, such as particular classes of molecules. But life may be vastly different on other planets and moons, particularly as we expand our efforts to explore ocean worlds like Europa and Enceladus.
Andrew D. Ellington, Sarah Stewart Johnson, Paul R. Mahaffy, Eric V. Anslyn, Heather Graham   +4 more
openaire   +3 more sources

Mineralogically Diverse and Salt‐Rich Regolith in Jezero Crater Characterized Using X‐Ray Spectroscopy

Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract The Planetary Instrument for X‐ray Lithochemistry (PIXL) onboard the Perseverance rover has characterized the composition of Martian regolith at a scale of hundreds of microns using micro‐focus X‐ray fluorescence spectroscopy. PIXL data reveal a diverse population of regolith grains with distinct spectral, chemical, and crystallographic ...
Andrew O. Shumway, Tanya V. Kizovski, David C. Catling, Scott J. VanBommel, Michael W. M. Jones, Brendan J. Orenstein, Mariek E. Schmidt, Michael M. Tice, Joel A. Hurowitz, Abigail L. Knight, Benton C. Clark, Lawrence Wade, Emily L. Cardarelli, An Y. Li, Mike J. Zawaski, David A. Klevang, William T. Elam, Elisabeth M. Hausrath, Allan H. Treiman, Jesper Henneke, Nicholas J. Tosca, Yang Liu, Morgan L. Cable, Abigail C. Allwood   +23 more
wiley   +1 more source

Directly Imaging Rocky Planets from the Ground [PDF]

, 2019
Over the past three decades instruments on the ground and in space have discovered thousands of planets outside the solar system. These observations have given rise to an astonishingly detailed picture of the demographics of short-period planets, but are
Artigau, É., Bailey, V., Baranec, C., Beichman, C., Benneke, B., Birkby, J., Bose, S. N., Brandt, T., Chilcote, J., Chun, M., Close, L., Crossfield, I., Currie, T., Dekany, R., Delorme, J. R., Dong, C., Dong, R., Doyon, R., Dressing, C., Fitzgerald, M., Fortney, J., Frazin, R., Gaidos, E., Guyon, O., Hashimoto, J., Hillenbrand, L., Howard, A., Jensen-Clem, R., Jovanovic, N., Kawahara, H., Knutson, H., Konopacky, Q., Kotani, T., Liu, M., Lozi, J., Lu, J., Macintosh, B., Males, J., Marley, M., Marois, C., Mawet, D., Mazin, B., Meeker, S., Millar-Blanchaer, M., Mondal, S., Murakami, N., Murray-Clay, R., Narita, N., Pyo, T. S., Roberts, L., Ruane, G., Serabyn, G., Shields, A., Simard, L., Skemer, A., Stelter, D., Tamura, M., Troy, M., Vasisht, G., Wallace, J. K., Wang, J., Wang, J., Wright, S.   +62 more
core   +1 more source

Spectral signatures of photosynthesis II: coevolution with other stars and the atmosphere on extrasolar worlds

, 2007
As photosynthesis on Earth produces the primary signatures of life that can be detected astronomically at the global scale, a strong focus of the search for extrasolar life will be photosynthesis, particularly photosynthesis that has evolved with a ...
Antígona Segura, David Crisp, Giovanna Tinetti, Govindjee, , Janet Siefert, Leger A., Leger A., Martin Cohen, Nancy Y. Kiang, Robert E. Blankenship, Tucker C.J., Victoria S. Meadows, Wang A.   +12 more
core   +2 more sources

Dark‐Toned Halite‐Enriched Veins Above the Marker Band Record a Drying Environment in Gale Crater

Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract The Martian surface preserves evidence of a global climate transition from wetter to drier conditions, but the nature of the fluids involved in this evolution remains poorly constrained. In Gale crater, the clay‐sulfate transition and presence of evaporite mineral assemblages can provide insights into the properties of these fluids and the ...
A. R. Trussell, J. F. Bell III, W. H. Farrand, E. B. Hughes, A. M. Eng, L. C. Kah, C. D. O’Connell‐Cooper, L. M. Thompson, P. J. Gasda, H. T. Manelski, R. Y. Sheppard, S. G. Banham, C. A. Mondro, B. S. Douglass, J. R. Johnson, G. Paar, O. Gasnault, A. R. Vasvada, F. Gómez, S. Le Mouélic, O. Forni, P.‐Y. Meslin   +21 more
wiley   +1 more source

Tides and the Evolution of Planetary Habitability

, 2008
Tides raised on a planet by its host star's gravity can reduce a planet's orbital semi-major axis and eccentricity. This effect is only relevant for planets orbiting very close to their host stars.
Brian Jackson, Delfosse X., Gorda S.Yu., Hut P., Naef D., Richard Greenberg, Rory Barnes, Sean N. Raymond   +7 more
core   +1 more source

Vertical Transmission of Gut Dysbiosis From Mothers With Gestational Diabetes to Infants

Journal of Diabetes, Volume 17, Issue 10, October 2025.
ABSTRACT Background Vertical transmission of microbes from a mother's gut to their offspring plays a crucial role in the genesis of the early life gut microbiome. Gestational Diabetes Mellitus (GDM) is the commonest metabolic disorder during pregnancy, which has adverse short‐ and long‐term effects on both maternal and infant health.
Jia Ming Low, Abhishek Gupta, Rachel Toh, Su Lin Lim, Shiao‐Yng Chan, Sanjay Swarup, Le Ye Lee   +6 more
wiley   +1 more source

Atmospheric Seasonality as an Exoplanet Biosignature [PDF]

The Astrophysical Journal Letters, 2018
Abstract Current investigations of exoplanet biosignatures have focused on static evidence of life, such as the presence of biogenic gases like O2 or CH4. However, the expected diversity of terrestrial planet atmospheres and the likelihood of both “false positives” and “false negatives” for conventional biosignatures motivate exploration
Victoria S. Meadows, Victoria S. Meadows, Andy Ridgwell, Andy Ridgwell, Stephanie L. Olson, Stephanie L. Olson, Stephen R. Kane, Stephen R. Kane, Christopher T. Reinhard, Christopher T. Reinhard, Edward W. Schwieterman, Timothy W. Lyons, Timothy W. Lyons   +12 more
openaire   +6 more sources

Interpretable Machine Learning Biosignature Detection From Ocean Worlds Analogue CO2 Isotopologue Data

Earth and Space Science
Future missions to icy ocean worlds (OW) such as Europa and Enceladus will evaluate the habitability and potential for biosignatures on these worlds. These missions will benefit from autonomous science and machine learning (ML) methods to process high ...
Lily A. Clough, Victoria DaPoian, Jonathan D. Major, Lauren M. Seyler, Brett A. McKinney, Bethany P. Theiling   +5 more
doaj   +1 more source