The Universe; from Flat Earth to Quasar |
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Page 155
... Sirius in 1844 ( see page 39 ) . Sirius and its companion moved in elliptical orbits about their mutual center of gravity , with a period of revolution of fifty years . Sirius is sometimes referred to as " Sirius A , " therefore , in ...
... Sirius in 1844 ( see page 39 ) . Sirius and its companion moved in elliptical orbits about their mutual center of gravity , with a period of revolution of fifty years . Sirius is sometimes referred to as " Sirius A , " therefore , in ...
Page 156
... Sirius B as a star of magnitude 7.1 . This is not terribly dim , of course , but the Sirius star system is only 8.8 light - years away . To be at that distance and still appear so dim , Sirius B had to have a luminosity only a hundredth ...
... Sirius B as a star of magnitude 7.1 . This is not terribly dim , of course , but the Sirius star system is only 8.8 light - years away . To be at that distance and still appear so dim , Sirius B had to have a luminosity only a hundredth ...
Page 167
Isaac Asimov. Sirius B lived faster than Sirius A , and this would imply by the mass - luminosity relation that Sirius B is more massive than Sirius A , perhaps far more massive . Yet , Sirius B , in its white dwarf state at least , has ...
Isaac Asimov. Sirius B lived faster than Sirius A , and this would imply by the mass - luminosity relation that Sirius B is more massive than Sirius A , perhaps far more massive . Yet , Sirius B , in its white dwarf state at least , has ...
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American astronomer Andromeda galaxy Andromeda Nebula angular momentum antimatter astronomer big bang bright century Cepheids close contracting core cosmic egg cosmic rays Crab Nebula detected determined diameter direction distance Earth electrons emitted energy eons existence explosion fact finite 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