Miniature gravity detector could peer inside planets

 作者:欧阳馋径     |      日期:2019-03-14 05:19:01
By Stephen Battersby PEERING beneath the surface of Mars and other planets to reveal buried geological features could get easier, thanks to a nifty new silicon gadget. The device, called a gravity gradiometer, has been designed to measure how much the force of gravity changes from place to place, enabling it to map a planet’s gravitational field. The idea is simple. Take two masses, each hanging from a spring. If one mass is slightly closer to a planet’s surface,