"Nasa Detects Mysterious Signal from Beyond Our Galaxy in Telescope Data"

NASA's Fermi Gamma-ray Space Telescope has detected an unusual and unexplained signal from deep space while analyzing 13 years of data, challenging scientists' understanding of space rays. The signal, found by chance, is outside our galaxy and has a nearly identical magnitude to one of the oldest gamma-ray features, perplexing researchers. This discovery, detailed in The Astrophysical Journal Letters, could be linked to a cosmic gamma-ray feature observed in 2017, marking a significant and unexpected finding in the realm of gamma-ray astronomy.