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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 951 |  | Star cluster | Group of stars | Physical sciences | 0 | 0 | 0 |
| 952 |  | Star formation | Gravitational process studied in astronomy | Physical sciences | 0 | 0 | 0 |
| 953 |  | Star system | Small number of stars that orbit each other | Physical sciences | 0 | 0 | 0 |
| 954 |  | Starburst galaxy | Galaxy undergoing an exceptionally high rate of star formation | Physical sciences | 0 | 0 | 0 |
| 955 |  | State of matter | Forms which matter can take | Physical sciences | 0 | 0 | 0 |
| 956 | Statics | Branch of mechanics concerned with balance of forces in nonmoving systems | Physical sciences | 0 | 0 | 0 | |
| 957 | Statistical mechanics | Physics of many interacting particles | Physical sciences | 0 | 0 | 0 | |
| 958 |  | Steel | Alloy of iron and carbon | Physical sciences | 0 | 0 | 0 |
| 959 |  | Stellar black hole | Black hole formed by a collapsed star | Physical sciences | 0 | 0 | 0 |
| 960 |  | Stellar classification | Classification of stars based on spectral properties | Physical sciences | 0 | 0 | 0 |
| 961 |  | Stellar evolution | Changes to stars over their lifespans | Physical sciences | 0 | 0 | 0 |
| 962 |  | Stellar kinematics | Study of the movement of stars | Physical sciences | 0 | 0 | 0 |
| 963 |  | Stellar magnetic field | Magnetic field generated inside a star | Physical sciences | 0 | 0 | 0 |
| 964 |  | Stellar structure | Structure of stars | Physical sciences | 0 | 0 | 0 |
| 965 |  | Steppe | Ecoregion of plain grasslands without trees | Physical sciences | 0 | 0 | 0 |
| 966 |  | Steradian | SI derived unit of solid angle | Physical sciences | 0 | 0 | 0 |
| 967 |  | Stiffness | Resistance to deformation in response to force | Physical sciences | 0 | 0 | 0 |
| 968 |  | Storm | Disturbed state of an astronomical body's atmosphere | Physical sciences | 0 | 0 | 0 |
| 969 |  | Strait | Waterway connecting two bodies of water | Physical sciences | 0 | 0 | 0 |
| 970 |  | Stratigraphy | Study of rock layers and their formation | Physical sciences | 0 | 0 | 0 |
| 971 | Strength of materials | Physical sciences | 0 | 0 | 0 | ||
| 972 |  | Stress (mechanics) | Physical quantity that expresses internal forces in a continuous material | Physical sciences | 0 | 0 | 0 |
| 973 | String theory | Theory of subatomic structure | Physical sciences | 0 | 0 | 0 | |
| 974 |  | Strong interaction | Binding of quarks in subatomic particles | Physical sciences | 0 | 0 | 0 |
| 975 |  | Strontium | Chemical element with atomic number 38 (Sr) | Physical sciences | 0 | 0 | 0 |
| 976 |  | Subatomic particle | Particle smaller than an atom | Physical sciences | 0 | 0 | 0 |
| 977 |  | Substance (chemistry) | Form of matter | Physical sciences | 0 | 0 | 0 |
| 978 | Substitution reaction | Chemical reaction in which one functional group in a compound is replaced by another | Physical sciences | 0 | 0 | 0 | |
| 979 |  | Sulfate | Anion of sulfur with 4 oxygen atoms | Physical sciences | 0 | 0 | 0 |
| 980 |  | Sulfur | Chemical element with atomic number 16 (S) | Physical sciences | 0 | 0 | 0 |
| 981 |  | Sulfuric acid | Chemical compound (H2SO4) | Physical sciences | 0 | 0 | 0 |
| 982 |  | Summer | Hottest of the four temperate seasons | Physical sciences | 0 | 0 | 0 |
| 983 |  | Sun | Star at the centre of the Solar System | Physical sciences | 0 | 0 | 0 |
| 984 |  | Superconductivity | Electrical conductivity with exactly zero resistance | Physical sciences | 0 | 0 | 0 |
| 985 | | Supergiant | Type of star that is massive and luminous | Physical sciences | 0 | 0 | 0 |
| 986 |  | Supermassive black hole | Largest type of black hole | Physical sciences | 0 | 0 | 0 |
| 987 |  | Supernova | Astrophysical phenomenon | Physical sciences | 0 | 0 | 0 |
| 988 |  | Superposition principle | Fundamental principle of physics | Physical sciences | 0 | 0 | 0 |
| 989 | Supersymmetry | Symmetry between bosons and fermions | Physical sciences | 0 | 0 | 0 | |
| 990 |  | Surface tension | Tendency of a liquid surface to shrink to reduce surface area | Physical sciences | 0 | 0 | 0 |
| 991 |  | Suspension (chemistry) | Heterogeneous mixture of solid particles dispersed in a medium | Physical sciences | 0 | 0 | 0 |
| 992 |  | Swamp | Forested wetland | Physical sciences | 0 | 0 | 0 |
| 993 |  | Symmetry (physics) | Feature of a system that is preserved under some transformation | Physical sciences | 0 | 0 | 0 |
| 994 | Syngas | Fossil fuel derived from other hydrocarbon sources | Physical sciences | 0 | 0 | 0 | |
| 995 |  | Synthetic element | Chemical elements that do not occur naturally | Physical sciences | 0 | 0 | 0 |
| 996 |  | Taiga | Biome characterized by coniferous forests | Physical sciences | 0 | 0 | 0 |
| 997 |  | Talc | Phyllosilicate mineral in the pyrophyllite-talc group | Physical sciences | 0 | 0 | 0 |
| 998 |  | Tannin | Class of astringent, bitter plant polyphenolic chemical compounds | Physical sciences | 0 | 0 | 0 |
| 999 |  | Tantalum | Chemical element with atomic number 73 (Ta) | Physical sciences | 0 | 0 | 0 |
| 1000 |  | Tau (particle) | Elementary subatomic particle with negative electric charge | Physical sciences | 0 | 0 | 0 |
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