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Metal-rich stars are less suitable for the evolution of life on their planets

open access: yesNature Communications, 2023
Atmospheric ozone and oxygen protect the terrestrial biosphere against harmful ultraviolet (UV) radiation. Here, we model atmospheres of Earth-like planets hosted by stars with near-solar effective temperatures (5300 to 6300 K) and a broad range of ...
Anna V. Shapiro   +9 more
doaj   +1 more source

Simplified Relations for the Martian Night-Time OH* Suitable for the Interpretation of Observations

open access: yesRemote Sensing, 2022
Observations of excited hydroxyl (OH*) emissions are broadly used for inferring information about atmospheric dynamics and composition. We present several analytical approximations for characterizing the excited hydroxyl layer in the Martian atmosphere ...
Mykhaylo Grygalashvyly   +4 more
doaj   +1 more source

Determination of Spatial Scale in Martian Landscape Images Acquired by the Curiosity Rover, and Viewing Image Scale and Target Chemistry Using the ASIC Website

open access: yesEarth and Space Science, 2023
In this paper we describe a method to compute spatial scales for images acquired by NASA's Mars Curiosity rover (Mars Science Laboratory, MSL). The method is based on the assumption that the rover stands on an infinite plane that may have any orientation
Walter Goetz   +4 more
doaj   +1 more source

Brine residues and organics in the Urvara basin on Ceres

open access: yesNature Communications, 2022
The authors report the discovery of salts and fresh organic-rich exposures in the Urvara basin, possibly linked to a late resurfacing of the crater floor. These results are consistent with a deep-seated brine/salt reservoir in the crust of Ceres.
A. Nathues   +8 more
doaj   +1 more source

Development of Synthesis and Fabrication Process for Mn-CeO2 Foam via Two-Step Water-Splitting Cycle Hydrogen Production

open access: yesEnergies, 2021
The effects of doping manganese ions into a cerium oxide lattice for a thermochemical two-step water-splitting cycle to produce oxygen and hydrogen and new synthesis methods were experimentally investigated.
Hyun-Seok Cho   +4 more
doaj   +1 more source

In Situ Optimized Substrate Witness Plates: Ground Truth for Key Processes on the Moon and Other Planets

open access: yesEarth and Space Science, 2023
Future exploration efforts of the Moon, Mars, and other bodies are poised to focus heavily on persistent and sustainable survey and research efforts, especially given the recent interest in a long‐term sustainable human presence at the Moon. Key to these
Prabal Saxena   +14 more
doaj   +1 more source

Full-disc Ca ii K observations—A window to past solar magnetism

open access: yesFrontiers in Astronomy and Space Sciences, 2022
Full-disc observations of the Sun in the Ca ii K  line provide one of the longest collections of solar data. First such observations were made in 1892 and since then various sites around the world have carried out regular observations, with Kodaikanal ...
Theodosios Chatzistergos   +2 more
doaj   +1 more source

Predictions of the geomagnetic secular variation based on the ensemble sequential assimilation of geomagnetic field models by dynamo simulations

open access: yesEarth, Planets and Space, 2020
The IGRF offers an important incentive for testing algorithms predicting the Earth’s magnetic field changes, known as secular variation (SV), in a 5-year range. Here, we present a SV candidate model for the 13th IGRF that stems from a sequential ensemble
Sabrina Sanchez   +2 more
doaj   +1 more source

Author's Reply to Comment by Greaves et al. on “Phosphine in the Venusian Atmosphere: A Strict Upper Limit From SOFIA GREAT Observations”

open access: yesGeophysical Research Letters, 2023
In an attempt to understand the findings presented in the Comment by Greaves et al. (2023, https://doi.org/10.1029/2023GL103539), we followed their data analysis methodology, omitting the hot and cold‐load calibrations that are an important part of the ...
M. A. Cordiner   +15 more
doaj   +1 more source

Li-Ion Battery State of Health Estimation Based on Short Random Charging Segment and Improved Long Short-Term Memory

open access: yesIET Signal Processing, 2023
Lithium-ion batteries have been used in a wide range of applications, including electrochemical energy storage and electrical transportation. In order to ensure safe and stable battery operation, the State of Health (SOH) needs to be accurately estimated.
Aina Tian   +7 more
doaj   +1 more source

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