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The Story of Telescopes
The Atmosphere Above us
Manned Telescopes in Space
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aboard absorption altitude American amount angular resolution astronomical atmos atmosphere atomic attained balloon Boeing Company cameras celestial bodies cent century chapter cosmic courtesy Crab Nebula crater Cytherean density detect detector disc distance domain Earth electromagnetic emission emitted energy experiments fact field fly-by focal length focal ratio Galileo Galileo Galilei ground heliocentric orbits hydrogen images infrared instruments intensity interplanetary interstellar July laser latter launched less limited Luna 13 Luna 9 lunar surface Mariner Mars Martian surface measurements ment miles mirror mission Moon NASA objects observations Observatory October operating optical window Palomar Mountain parsecs particles payload photographs planet planetary principal probe radiation radio Ranger reflector refraction refractor rockets Russian satellite scanned soft landings solar corona spacecraft spectral spectrum stars stellar Stratoscope Surveyor telescopes in space television terrestrial tion transmission transmitted ultraviolet USSR V-2 rocket Venus water vapor wavelengths X-ray X-ray source y-ray Zond