Universal Positioning System can use gravitational electromagnetic 3D volumetric recordings
https://www.cambridge.org/core/journals/international-journal-of-astrobiology/article/pulsar-positioning-system-a-quest-for-evidence-of-extraterrestrial-engineering/E4CCF6D8F46B4B64F7AB99972C30903E Found this paper looking at neutron/quark/gluon star interiors and gravitational waves. But the idea that civilizations might be detected by their use of unique signatures embedded in their communication struck me as useful. “Earth’s sun” is not a sequence of text characters but a unique all possible frequencies large data signature of the mass
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