Gravitational wave astronomy has detected nearly 100 cosmic events since 2015, confirming Einstein's predictions and revealing black holes and neutron stars in unprecedented detail. These ripples in spacetime are testing the limits of physics and opening new frontiers in our understanding of the universe.
Cosmic strings—hypothetical one-dimensional defects from the Big Bang—may soon be detected or ruled out by gravitational wave observatories, CMB surveys, and galaxy mapping. These ultra-dense threads could validate grand unified theories, constrain inflation models, and even provide evidence for string theory. Within a decade, missions like LISA, CMB-S4, and pulsar timing arrays will deliver a verdict, reshaping our understanding of the universe's earliest moments and fundamental physics.
Scientists searching for alien Dyson spheres face an unexpected challenge: exotic stellar objects called strange stars could produce nearly identical observational signatures, creating a cosmic shell game between natural phenomena and potential technosignatures.
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