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When they were not sure what caused the signals they detected, Jocelyn Bell and her college advisor D. Anthony Hewish labeled the signal LGM for Little Green Men. They thought it could possibly be a beacon from an alien source.
Source: tatoeba (3958506)
A life-hostile change in the Martian climate may have taken place early enough to arrest the evolution of complex life and, of course, the emergence of LGM,* which means the riverbeds may indeed hold the fossil remains of an extinct primitive biota.
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.