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extragalactic background light
extragalactic background radiation
extragalactic binary
extragalactic Cepheid
extragalactic compact radio sources
extragalactic diffuse X-ray emission
Extragalactic diffuse γ-ray background(DGRB)
extragalactic galaxy detection
extragalactic HⅡ region
extragalactic infrared astronomy
extragalactic infrared background
extragalactic infrared source
extragalactic matter
extragalactic medium
extragalactic nebula
extragalactic nova
extragalactic object
extragalactic planetary nebula
extragalactic radio astronomy
extragalactic radio background
extragalactic radio radiation
extragalactic radio source
extragalactic source
extragalactic space
extragalactic supernova
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