Comets 30
Nebulae 32
The Milky Way 33
The Number of Stars 33
The Position of Our Solar System 35
The Movement of Our Solar System 36
Distances of the Stars 36
Temperature of the Stars 37
Fixed Stars 37
Double Stars 38
Colored Stars 38
Variable Stars 39
Temporary Stars 40
Star Groups--Clusters 40
Eclipses 41
Telescopes 43
The Spectroscope: Spectrum Analysis 43
Photography 46
The Tides 47
Gravitation 48
The Ether 49
Atomic Analogies 49
Thunder and Lightning 50
Fireballs 50
Atmospheric Electricity 50
The Earth’s Magnetism 51
The Aurora Borealis 51
Time: Measurement of 52
Astronomy for Beginners · The Wunder Library — complete classics, free to read, with narration.