The Universe: From Flat Earth to Quasar |
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American astronomer Andromeda galaxy Andromeda Nebula angular momentum antimatter astronomer bright century Cepheids close core 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 infinite infrared interstellar Jupiter kilometers light light-years luminosity luminous Magellanic Cloud magnetic field magnitude main sequence mass massive matter microwave emission miles Milky million Moon moving neutrino neutron star novae nuclear reactions nucleus objects observed orbit ordinary Palomar Observatories parallax particles percent period photons physicist planetary planets produced proper motion pulsating quantity quasars radial velocity radiation radio sources receding red shift region rotation seemed 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 wavelengths waves white dwarf Wilson and Palomar X-ray