InSight SEIS tether moves with changing temperature
Temperatures on Mars vary widely between day and night, causing spacecraft materials to expand and contract slightly. As a result, the InSight SEIS tether moved overnight between sols 37 and 38. These two photos were taken in the afternoon, near the hottest part of the day (at 13:24 and 14:09 local time, respectively). The load shunt assembly located close to the SEIS instrument is designed to isolate SEIS from this thermoelastic deformation of the tether.