Secrets of Our Spaceship MoonDell, 1979 - 282 pages |
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Common terms and phrases
actually alien intelligence Apollo 11 appears areas artificial construction asteroid astronauts astronomer believe billion capture celestial circular claims cloud concludes Condon Report convinced cosmic crater crust discovery Emphasis added evidence exist explain fact Harold Urey heat hollow Moon hollowed-out huge hull Hynek impact indicate inner inside the Moon iron Jessup Latham lava layer Lunan lunar experts lunar samples magnetic maria mascons material melt metallic meteors miles Moon rocks Moon's surface Mysterious Spaceship Moon NASA NASA scientist NASA's natural natural satellite observed orbit orthodox scientists Paul Gast planet Earth planetoid points probes problem puzzling radio signals radioactive researchers satellite scientific seems seen seismic seismometers sightings solar system Soviet scientists Soviet spaceship theory space agency spacecraft Spaceship Moon speculate spots star startling structures titanium tremors Unidentified Flying Objects universe Vasin and Shcherbakov volcanic Walter Sullivan Wilkins