H

Hale Telescope 38 Hale-Bopp 122 Halley, Edmond 20 Halley's comet 20, 35 Hare (Lepus) 209 Hawking, Stephen 37 Helix Nebula (NGC 7293)

65, 187, 187 Herbig-Haro objects 63 Hercules 162 Herdsman (Bootes) 161 Herschel, William 21 Hertzsprung-Russell diagram

23, 60, 61 Hipparchus 17 Horologium (The Pendulum

Clock) 221 Horsehead Nebula 191 Hoyle, Fred 25 Hubble, Edwin 24, 25, 54 Hubble Constant 54 Hubble Space Telescope 39 Hunter (Orion) 190-1 Hunting Dogs (Canes

Venatici) 160 Huygens, Christiaan 115 Hyades 172, 173 Hydra (The Water Snake) 194-5

hydrogen chain 36 Hydrus (The Little Water

Snake) 221 Hyperion 35 hypernovae 53

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