Races can be extraterrestrial.Logical formLearned from30 sentences. An invasion can be extraterrestrial.Logical formLearned from29 sentences. Impacts can be extraterrestrial.Logical formLearned from29 sentences. A source can be extraterrestrial.Logical formLearned from28 sentences. Sources can be extraterrestrial.Logical formLearned from28 sentences. A technology can be extraterrestrial.Logical formLearned from27 sentences. Threats can be extraterrestrial.Logical formLearned from26 sentences. Rocks can be extraterrestrial.Logical formLearned from25 sentences. A (vegetation evaluator) can be extraterrestrial.Logical formLearned from25 sentences. A signal can be extraterrestrial.Logical formLearned from25 sentences. An environment can be extraterrestrial.Logical formLearned from24 sentences. A (life form) can be extraterrestrial.Logical formLearned from23 sentences. An intervention can be extraterrestrial.Logical formLearned from23 sentences. Agreements may concern extraterrestrial life.Logical formLearned from23 sentences. A search can be for extraterrestrial intelligence.Logical formLearned from22 sentences.