Results 31 to 40 of about 992,600 (206)
The Planetary Science Journal, 2023 Near-Earth asteroids (NEAs) are a key test bed for investigations into planet formation, asteroid dynamics, and planetary defense initiatives. These studies rely on understanding NEA sizes, albedo distributions, and regolith properties.
Samuel A. Myers +6 more
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OSIRIS-APEX: An OSIRIS-REx Extended Mission to Asteroid Apophis
The Planetary Science Journal, 2023 The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft mission characterized and collected a sample from asteroid (101955) Bennu.
Daniella N. DellaGiustina +53 more
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Bulk Thermal Conductivity of Granular Aggregates: Decoupling Coordination Number and Porosity
The Planetary Science JournalBoth internal evolution and orbital dynamics of asteroids are influenced by the thermal conductivity of their surface regolith and boulders, yet the microstructural factors that control it remain poorly constrained.
Bhuvan Agrawal +8 more
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Advanced Science, EarlyView.The sea cucumber Holothuria leucospilota detects blue and adjacent wavelengths of light via an r‐opsin with a maximum absorption at 459 nm. In the oral tentacles, papillae, and tube feet, distinct light‐sensing structures with specialized morphologies are formed, constituting a unique pentaradial and bilateral combined photoreception system.
Jiasheng Huang +20 more
wiley +1 more source
Simulating the (99942) Apophis Earth Flyby Using a Contact Binary Model
The Planetary Science JournalThis paper investigates the mass shifts of asteroid (99942) Apophis during its 2029 close encounter with Earth, using the contact dynamics method, a type of discrete element method. Unlike previous analyses, we model the asteroid as a contact binary body
Hai-Shuo Wang +2 more
doaj +1 more source
Predicting Performance of Hall Effect Ion Source Using Machine Learning
Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.This study introduces HallNN, a machine learning tool for predicting Hall effect ion source performance using a neural network ensemble trained on data generated from numerical simulations. HallNN provides faster and more accurate predictions than numerical methods and traditional scaling laws, making it valuable for designing and optimizing Hall ...
Jaehong Park +8 more
wiley +1 more source
The Planetary Science JournalAsteroid Justitia is a special main-belt object, being an extremely red body with a steeper spectral slope than any other D-type asteroid. Conversely, its spectral and polarimetric properties resemble organics-rich Centaurs and trans-Neptunian objects ...
Anna Marciniak +18 more
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Regolith mechanics on Asteroid surfaces [PDF]
, 2017 Introduction: It is very likely that most aster- oids surfaces are covered by a regolith layer. We are focussing on the mechanical properties of such regolith, i.e., a granular material under micro-gravity (µ-g) conditions. Any operations on asteroids that are not remote, need to interact mechanically with the surface material, and for resource ...
Biele, Jens, Ulamec, Stephan
openaire +2 more sources
Surface Geology of Jupiter’s Trojan Asteroids
Space Science Reviews, 2023 AbstractThe surface geology of Jupiter’s Trojan asteroids is one of the scientific investigations of the NASALucymission. A dedicated Geology Working Group will implement these studies using primarily panchromatic and color imaging data and complement the interpretation of these data with theoretical models, such as collisional evolution models ...
S. Marchi +3 more
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Deep Underground Science and Engineering, EarlyView.High atmospheric pressure (120 kPa) in deep underground counteracts humidity‐induced physiological stress in plants, stabilizing water balance and enhancing antioxidative defenses. This synergy boosts biomass despite elevated humidity, demonstrating sustainable deep underground agriculture potential under climate uncertainty.
Yuxin He +6 more
wiley +1 more source