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aerial aircraft alien Alpha Centauri already appearance artifacts astronomer atmosphere atomic Black Hole Black I-Iole bright century certainly Chapter circumstances clearly cloud concemed considerable cosmic course craft creatures Cygnus X-1 deﬁnite distance doubt Earth event event horizon exist extraterrestrial Ezekiel fact ﬁeld ﬁgure ﬁnd ﬁnite ﬁre ﬁrst ﬂight ﬂying saucer fossil galactic galaxy highly inﬁnite interstellar interstellar travel intriguing J. W. Morgan joumey less life-forms light-years look meteorite meteors miles million moon nature neutron star non-space normal Observatory ocean orbit oxygen peculiar perhaps planet planetary possible present probably probes race reach reason record reﬂect region remote render reports respect retum science ﬁction seems seen ship sightings signiﬁcant simply solar system space space-time Spaceﬂight speed of light stars starship strange surface tachyons techniques terrestrial thing thought tion Tunguska UFOlogy universe velocity vessel visits wheels white dwarf writer