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Warp drives may or may not be possible, but if they are then could a distant alien civilization’s warp fields produce gravitational waves that we could see here on Earth? According to a recent study… Actually maybe, at least eventually. And we now know just what to look for and how to look for it.

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Space Pod 3D model: futaba@blender
What no one has seen before: gravitational waveforms from warp drive collapse: https://arxiv.org/pdf/2406.