The formal test programme has begun on the technologies required to detect gravitational waves in space.
Europe's Lisa Pathfinder (LPF) probe is engaging in a series of experiments roughly 1.5 million km from Earth.
The project has heightened interest, of course, because of the first sampling of the "cosmic ripples" made by ground-based detectors last September.
A successful demo for LPF would pave the way for a fully operational orbiting observatory in the 2030s.
This would likely be known simply as Lisa - the Laser Interferometer Space Antenna.
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