H

Hale, Alan 124

Hale-Bopp (comet) 124-125, 126, 127

half-lives 86, 100 Halley, Edmund 127-128 Halley's comet 127-128 brightness of 2-3 mass of 150 missions to 155-157 sightings of 125, 127-128 Harding, Karl Ludwig 8, 10 Hastings, Battle of (1066) 125 Hayabusa (spacecraft) 160 heat for differentiation 91-94 energy and 94-95 and oxygen isotopes 85-86 and spherical shape 90 heat capacity 94 6 Hebe (asteroid) 120 624 Hektor (asteroid) 79,158 Helin, Eleanor Francis 69 Heloise crater (Venus) C-4 Hermes (asteroid) 14 121 Hermione (asteroid) 78-79 Herschel, John 20 Herschel,William 8, 10 Herschel crater (Moon) 22, 24 hexahedrites 114 944 Hidalgo (body) 81 Hilda-family asteroids 64, 79 Hoba (meteorite) 114 Holman, Matt 142-144 Homer (Greek historian) 65 Hooke, Robert 20-21 horseshoe orbit 74 howardites 106, 107 Hungaria asteroids 75 Huth, Johann Sigismund Gottfried 8 hypervelocity impacts 37, 53-59

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