Info

9 Properties and distances of celestial objects 253

9.1 Introduction 254

9.2 Luminosities 254

9.3 Masses 256 Earth and sun • Moon • Spiral galaxies and the

Galaxy • Clusters of galaxies and the virial theorem

9.4 Temperatures 260 Thermal and non-thermal radiation • Temperature measurements - Kinetic temperature - Color temperature -Effective temperature - Excitation temperature - Ionization temperature - Saha equation

9.5 Distances and sizes 265 Distance ladder • Moon, earth, and sun • Trigonometric parallax • Distances to open clusters - Convergence -Distance to a cluster star - Distance to the cluster • Secular and statistical parallaxes - Secular parallax - Statistical parallax • Standard candles • Spectroscopic classification • Galactic center and Crab nebula distances • Cepheid and RR Lyrae variables • Hubble law - Receding galaxies - Expanding universe - Value of Hubble constant - Redshift - Size and age of the universe • Extragalactic "standard candles" - Luminosity functions - Supernovae - Line-broadening in galaxies - Surface brightness fluctuations • Ultimate goals

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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