Uploaded February 2021 | Updated September 2026, 15 minutes ago

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It is 16 February 2016. The LISA Pathfinder spacecraft is in orbit around the Lagrange point 1. The two testmasses at the heart of the mission payload must be released into free fall to begin the experiment. But has the locking mechanism survived the incredible stresses of the space launch? If this operation fails, the mission is over…

Find out more at: youtu.be/wUZ81wItsZI and http://www.esa.int/Science_Exploration/Space_Science/Test_cubes_floating_freely_inside_LISA_Pathfinder