All atmosphere-less planetary bodies are covered with a dust layer, theso-called regolith, which determines the optical, mechanical and thermalproperties of their surface. These properties depend on the regolith material,the size distribution of the particles it consists of, and the porosity towhich these particles are packed. We performed experiments in parabolic flightsto determine the gravity dependency of the packing density of regolith forsolid-particle sizes of 60 $\mu$m and 1 mm as well as for 100-250 $\mu$m-sizedagglomerates of 1.5 $\mu$m-sized solid grains. We utilized g-levels between 0.7m s$^{-2}$ and 18 m s$^{-2}$ and completed our measurements with experimentsunder normal gravity conditions. Based on previous experimental and theoreticalliterature and supported by our new experiments, we developed an analyticalmodel to calculate the regolith stratification of celestial rocky and icybodies and estimated the mechanical yields of the regolith under the weight ofan astronaut and a spacecraft resting on these objects.
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机译：所有无大气层的行星体都覆盖有一层尘埃，即所谓的粉煤灰，它决定了其表面的光学，机械和热学性质。这些性质取决于硬脂材料，其组成的颗粒的尺寸分布以及这些颗粒所填充的孔隙率。我们在抛物线形飞行中进行了实验，以确定固体颗粒尺寸为60 $ /μm和1 mm以及尺寸为100-250 $ \μ$ m的团聚体为1.5 $ \μ米大小的固体颗粒。我们利用介于0.7m s $ ^ {-2} $和18 m s $ ^ {-2} $之间的g级，并在正常重力条件下通过实验完成了测量。在先前的实验和理论文献的基础上，并在我们的新实验的支持下，我们开发了一种分析模型来计算天体岩石和冰体的re石分层，并估算了在宇航员和搁在这些物体上的航天器的重量下re石的机械产率。
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