S

Sagan, Carl 142 Sakigake (spacecraft) 157 Saturn asteroids around 65,79—81 comets striking 80 moons of 82, 83 scattered-disk objects 139, 140 Schroeter, Johann Hieronymus 9 Schubert, Friedrich Theodor 9 Schultz, Peter 46 Science (journal) 27 Scrovegni, Enrico 128 sedimentary rocks 32 Sedna (object) xiv, 142, 151-152 self-gravitation, and spherical shape

89-90,92 semimajor axis 66-68, 61 semiminor axis 66-68, 61 Serenitatis, Mare 20 2000 SG344 (asteroid) 57 Shallowwater aubrite 112 shatter cones 51 shattered bodies 62 shergottites 107 shock waves cosmic speed and 35, 42 from falling giant meteorites 35, 42

impact on rock 43 Shoemaker-Levy (comet) 33 shooting stars 153, C-1 Siberia 18, 41 silicate 94-95, 115 silica tetrahedras 86-87 Singletary, Steven 111 Skjellerup-Maristany (comet) 126 Small Bodies Names Committee 14 Smith,George 136 SNC meteorites 107,110 snow line 75 sodium tails 124 solar system age of 102 edges of 148-149 size of bodies in xi, 2

South Africa 20 Soviet Union 155-156 SpaceDev 161 Spacewatch program 54 spectral classes 117 spectrometers 159 spectrophotometry 117, 118 spherical shape 89-90, 92 spinel 98

Stardust (spacecraft) 128-131, 131,

132, 159-160 Stickney crater (Phobos) 49-50, .50 stishovite 51

stony-iron meteorites 88-89,

115-117 strewn field 38 strontium 100

S-type asteroids 117,119-121 Suisei (spacecraft) 156-157 sulfur 121 Sun and asteroid composition 61,117,

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