+**E7d** refers to a subtle, transient [Cosmic Anomaly](/wiki/Cosmic_Anomaly) first detected through gravitational wave observations. Its brief, enigmatic signature suggests a unique interaction within distant [Galaxies](/wiki/Galaxy).
+## See also
+- [Gravitational Waves](/wiki/Gravitational_Waves)
+- [Astrophysics](/wiki/Astrophysics)
+- [Black Holes](/wiki/Black_Hole)
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