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Laser Interferometer Space Antenna (LISA)
The observatory designed to detect gravitational waves from space.
The actual model file, as it will be printed. Drag to turn it.
LISA measures ripples in spacetime using laser beams between spacecraft flying millions of kilometres apart, picking up sources too low in frequency for detectors on the ground.
Published by NASA in their 3D Resources collection, which they state is free of copyright. Printed to order — scaled to about 80 mm on its longest side, and resizeable on the next page.