Core instrument of the LISA Pathfinder in-flight experiment. The golden cubes depict test masses that are maintained in near-perfect free fall. Selected for an Editors’ Suggestion and a Viewpoint in Physics.

From the article:

Sub-Femto-$g$ Free Fall for Space-Based Gravitational Wave Observatories: LISA Pathfinder Results
M. Armano et al.
Phys. Rev. Lett. 116, 231101 (2016)

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