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Extraterrestrial life as a psychological projective test
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angular momentum appears approximately artificial astronomer atmosphere atoms billion biological bright Chapter chemical clouds clusters contemporary cosmic Courtesy of Mt craters dark areas Deimos density detected disk distance Earth electrons emitted energy environment evolution example exist exosphere extraterrestrial Figure formed frequency Galactic galaxies helium Hertzsprung-Russell diagram hydrogen hypothesis increase infrared intelligent interstellar medium Jupiter large number laser lifetime light living systems luminosity lunar magnetic field main sequence Mars Martian mass material microorganisms molecular Moon motion nebula nucleic acids observations occur optical orbit origin oxygen Palomar Observatories panspermia parsecs particles perhaps period Phobos photograph planet planetary systems polar possible present primitive probably produced protons protostar radiation radio emission radius red giant region relatively rotation satellites signal solar system Soviet spacecraft spectral type spectrum stars stellar supernova surface technical civilization telescope temperature terrestrial transmitted ultraviolet universe velocity Venus wavelengths Wilson and Palomar