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Cosmology The Big Bang Theory
Early High Energy Astronomy
6 other sections not shown
active galaxies appears approximately Astrophysical atomic background black hole Chapter clusters core correlation cosmic rays cosmological Crab nebula Cygnus X-1 density detail detected detectors discovery discrete sources discussion distance doppler early effect electromagnetic spectrum electron emission energy range event fact field of view frequency galactic gamma-ray HEAO helium high energy astronomy hydrogen infrared instruments intensity launched lines luminosity main sequence mass material measured meter Milky mission nebulae neutron star nuclei objects Observatory observed obtained optical orbit particles photons postulated Proportional Counter pulsars quasars question radiation radio sources red shift regarded region relatively remnants resolution rotation satellite scan scientific sensitive sensors Seyferts shown simply solar space spacecraft spectral bands Spectrometer speed of light steady state theory stellar evolution suggested supernovae techniques telescope temperature tion Uhuru universe velocity visible wavelength X-ray sources yield