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Sean Carroll explains that advanced alien civilizations could theoretically engineer macroscopic wormholes to avoid detection by LIGO. Under Birkhoff's theorem, any perfectly spherically symmetric mass manipulation produces zero detectable gravitational waves.
Future gravitational wave observatories will expand the frequency spectrum of astronomical data. The space-based LISA mission will feature an arm length of 1 million kilometers to detect low-frequency mergers, while the ground-based Einstein Telescope will significantly upgrade LIGO's sensitivity.
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