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Interference of Light Waves
The Influence of the Earths Atmosphere on Astro
Recording the Image
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absorption altitude amount of energy angle apparent magnitude astronomical objects axis beam brightness celestial sphere centre cepheids chemical composition chromosphere clouds clusters components constant convection corona denote density depends determine dipole direction disk distance distribution Earth ecliptic electromagnetic emitted equator Figure free electrons function galactic galaxies given gravitational groups of stars H II regions H-R diagram heat heavier elements helium hence Hubble's law hydrogen illumination intensity interferometers interstellar gas interstellar matter ionized ions layers light luminosity magnetic field main sequence mass mean measurements medium mirror molecules motion move nuclei observed obtained occur optical orbit oxygen particles perpendicular photographic plate photons photosphere plane polarized position pressure processes quasars radial velocities radio radius reactions red shift regions result rocket rotation Section slit spectral lines spectral type spectrum spherical spiral arm stellar structure surface telescope temperature thermal tion vector wavelength waves white dwarf