D

Dactyl 125 dark energy 56 dark matter 51 December sky 274—7 Deimos 106

Delphinus (The Dolphin) 185

Delta Apodis 225

Delta Cephei 154

Delta Chamaeleontis 225

Delta Gruis 219

Delta Lyrae 163

Delta Orionis (Mintaka) 191

Delta Scorpii 204

Delta Scuti 182

Delta Telescopii 218

Deneb (Alpha Cygni) 165

diamond ring 278

Dione 114

Dobsonian telescope mount

142 Dog Star 66 Dolphin (Delphinus) 185 Doppler effect 54 Dorado (The Goldfish) 223 Double Cluster (NGC 884)

170, 170 Dove (Columba) 210 Draco (The Dragon) 153 Dragon (Draco) 153 Dumbbell Nebula (M27) 184, 184

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