在火星上进行的一次表面重力测量表明，盖尔陨石坑的基岩密度较低。
A surface gravity traverse on Mars indicates low bedrock density at Gale crater.
作者信息
Lewis Kevin W, Peters Stephen, Gonter Kurt, Morrison Shaunna, Schmerr Nicholas, Vasavada Ashwin R, Gabriel Travis
机构信息
Earth and Planetary Sciences Department, Johns Hopkins University, Baltimore, MD 21218, USA.
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
出版信息
Science. 2019 Feb 1;363(6426):535-537. doi: 10.1126/science.aat0738.
Gravimetry, the precise measurement of gravitational fields, can be used to probe the internal structure of Earth and other planets. The Curiosity rover on Mars carries accelerometers normally used for navigation and attitude determination. We have recalibrated them to isolate the signature of the changing gravitational acceleration as the rover climbs through Gale crater. The subsurface rock density is inferred from the measured decrease in gravitational field strength with elevation. The density of the sedimentary rocks in Gale crater is 1680 ± 180 kilograms per cubic meter. This value is lower than expected, indicating a high porosity and constraining maximum burial depths of the rocks over their history.
重力测量法，即对引力场的精确测量，可用于探测地球和其他行星的内部结构。火星上的“好奇号”火星车携带了通常用于导航和姿态确定的加速度计。我们对其进行了重新校准，以分离出火星车在盖尔陨石坑爬坡时引力加速度变化的特征。根据测量到的引力场强度随海拔高度的降低来推断地下岩石密度。盖尔陨石坑中沉积岩的密度为1680±180千克每立方米。这个值低于预期，表明孔隙率较高，并限制了这些岩石在其历史上的最大埋藏深度。
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