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The Life of a Star
Our Galaxy and Beyond
Theories of the Universe
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absorber absorption apparent magnitude arises arrow astronomer atom big-bang big-bang models black holes brightness centre Chapter CNO cycle cosmic rays cosmological models curve deﬁned deﬁnition described diagram distance Earth effect Einstein electric charge electromagnetic radiation electron emission emitted energy epoch estimated example exist expansion extragalactic ﬁnd ﬁnite ﬁrst ﬂux force frequency galactic geometry given gravitational Hale Observatories helium Hoyle Hubble’s constant hydrogen identiﬁed inﬁnite inﬂuence laboratory laws of motion laws of physics lines luminosity magnetic ﬁeld mass measured million moving Nebula neutron Newton’s laws Newtonian non-Euclidean non-Euclidean geometry nuclear nuclei object observations Olbers paradox orbit particle horizon particles Photograph physicist planets possible present proton QSOs radio source radius red-shift reﬂected region retarded s-process scientiﬁc signiﬁcant space space-time spectrum star steady-state steady-state Universe stellar supernova Suppose synchrotron temperature theoretical theory of relativity thermodynamic velocity of light wavelength waves zero