Chapter 14

AETHER AND STARRY WORLD

ART. 117. STARRY WORLD 306 " 118. STARS AND KEPLER'S LAWS 309 " 119. AETHER AND NEBULAE 313 " 120. WHAT IS A NEBULA? 314 " 121. AETHER AND NEBULAR HYPOTHESIS 317 " 122. KINDS OF NEBULAE 319