An impact can be extraterrestrial.Logical formLearned from53 sentences. Presence can be extraterrestrial.Logical formLearned from52 sentences. Signs can be constituted-of-or-filled-with extraterrestrial life.Logical formLearned from47 sentences. Bodies can be extraterrestrial.Logical formLearned from46 sentences. Environments can be extraterrestrial.Logical formLearned from44 sentences. An object can be extraterrestrial.Logical formLearned from42 sentences. A craft can be extraterrestrial.Logical formLearned from40 sentences. Extraterrestrial civilizations can be advanced.Logical formLearned from39 sentences. Extraterrestrial life may undergo a discovery.Logical formLearned from38 sentences. An activity can be extraterrestrial.Logical formLearned from37 sentences. An intelligent life can be extraterrestrial.Logical formLearned from37 sentences. Signals can be extraterrestrial.Logical formLearned from36 sentences. Samples can be extraterrestrial.Logical formLearned from34 sentences. Creatures can be extraterrestrial.Logical formLearned from32 sentences. A matter can be extraterrestrial.Logical formLearned from32 sentences.