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actually American astronomer Andromeda galaxy Andromeda Nebula angular momentum antimatter astronomer big bang bright century Cepheid close cosmic egg cosmic rays Crab Nebula detected determined diameter direction distance Earth electrons emitted energy eons existence explosion fact finite giant globular clusters gravitational field Greek helium helium-4 Herschel Hubble's hydrogen hydrogen atom infinite infrared interstellar Jupiter light light-years luminosity luminous Magellanic Clouds magnetic field magnitude main sequence mass massive matter microwave emission miles Milky millions Moon moving neutrinos neutron novae nuclear reactions nucleus objects observed orbit Palomar Observatories parallax particles percent period photons physicist planetary planets produced proper motion quantity quasars radial velocity radiation radio sources receding red shift region rotation seemed Shell Sirius Solar system space spectral class spectral lines spectrum sphere spiral arms stellar Sun's supernova suppose surface telescope temperature theory tion Universe Venus visible wavelength white dwarf Wilson and Palomar X-rays