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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 251 |  | Cyclone | Large scale rotating air mass | Physical sciences | 0 | 0 | 0 |
| 252 |  | Cygnus X-1 | X-ray binary in Cygnus containing a stellar black hole | Physical sciences | 0 | 0 | 0 |
| 253 | Dalton (unit) | Standard unit of mass for atomic-scale entities | Physical sciences | 0 | 0 | 0 | |
| 254 |  | Dark energy | Energy driving the accelerated expansion of the universe | Physical sciences | 0 | 0 | 0 |
| 255 | | Dark matter | Hypothetical invisible cosmic material | Physical sciences | 0 | 0 | 0 |
| 256 |  | Dark nebula | Type of interstellar cloud that obscures visible light | Physical sciences | 0 | 0 | 0 |
| 257 |  | Data | Unit of information | Physical sciences | 0 | 0 | 0 |
| 258 | Day | Time of one rotation around a planet axis | Physical sciences | 0 | 0 | 0 | |
| 259 | Decibel | Logarithmic unit expressing the ratio of physical quantities | Physical sciences | 0 | 0 | 0 | |
| 260 | Deformation (engineering) | Change in the shape or size of an object | Physical sciences | 0 | 0 | 0 | |
| 261 | Degenerate matter | Type of dense exotic matter in physics | Physical sciences | 0 | 0 | 0 | |
| 262 |  | Degree (angle) | Unit of plane angle where a full circle equals 360° | Physical sciences | 0 | 0 | 0 |
| 263 | Density | Mass per unit volume | Physical sciences | 0 | 0 | 0 | |
| 264 |  | Desert | Area of land where little precipitation occurs | Physical sciences | 0 | 0 | 0 |
| 265 |  | Dew | Droplets of water that form in the morning or evening | Physical sciences | 0 | 0 | 0 |
| 266 |  | Diamond | Form of carbon | Physical sciences | 0 | 0 | 0 |
| 267 |  | Dielectric | Electrically insulating substance able to be polarised by an applied electric field | Physical sciences | 0 | 0 | 0 |
| 268 |  | Diffraction | Interference phenomenon of waves | Physical sciences | 0 | 0 | 0 |
| 269 |  | Diffusion | Transport of dissolved species from the highest to the lowest concentration region | Physical sciences | 0 | 0 | 0 |
| 270 |  | Dipole | Electromagnetic phenomenon | Physical sciences | 0 | 0 | 0 |
| 271 |  | Direct current | Unidirectional flow of electric charge | Physical sciences | 0 | 0 | 0 |
| 272 | Dispersion (chemistry) | Chemical mixtures | Physical sciences | 0 | 0 | 0 | |
| 273 |  | Distillation | Method of separating mixtures | Physical sciences | 0 | 0 | 0 |
| 274 | Doppler effect | Frequency change of a wave for observer relative to its source | Physical sciences | 0 | 0 | 0 | |
| 275 |  | Drag (physics) | Retarding force on a body moving in a fluid | Physical sciences | 0 | 0 | 0 |
| 276 |  | Drainage basin | Land area where water converges to a common outlet | Physical sciences | 0 | 0 | 0 |
| 277 |  | Drought | Period with less precipitation than normal | Physical sciences | 0 | 0 | 0 |
| 278 |  | Dry lake | Area that contained a standing surface water body | Physical sciences | 0 | 0 | 0 |
| 279 |  | Dry season | Yearly period of low rainfall, especially in the tropics | Physical sciences | 0 | 0 | 0 |
| 280 |  | Dune | Hill of loose sand built by aeolian processes or the flow of water | Physical sciences | 0 | 0 | 0 |
| 281 |  | Dust storm | Meteorological phenomenon common in arid and semi-arid regions | Physical sciences | 0 | 0 | 0 |
| 282 |  | Dwarf galaxy | Small galaxy composed of up to several billion stars | Physical sciences | 0 | 0 | 0 |
| 283 |  | Dwarf planet | Small planetary-mass object | Physical sciences | 0 | 0 | 0 |
| 284 |  | Dysprosium | Chemical element with atomic number 66 (Dy) | Physical sciences | 0 | 0 | 0 |
| 285 |  | Eagle Nebula | Open cluster in the constellation Serpens | Physical sciences | 0 | 0 | 0 |
| 286 |  | Earth | Third planet from the Sun | Physical sciences | 0 | 0 | 0 |
| 287 |  | Earth science | Fields of natural science related to Earth | Physical sciences | 0 | 0 | 0 |
| 288 |  | Earth's crust | Earth's outer shell of rock | Physical sciences | 0 | 0 | 0 |
| 289 |  | Earth's inner core | Innermost part of Earth, a solid ball of iron-nickel alloy | Physical sciences | 0 | 0 | 0 |
| 290 |  | Earth's magnetic field | Physical sciences | 0 | 0 | 0 | |
| 291 |  | Earth's mantle | Layer of silicate rock | Physical sciences | 0 | 0 | 0 |
| 292 |  | Earth's outer core | Fluid layer between Earth's solid inner core and its mantle | Physical sciences | 0 | 0 | 0 |
| 293 |  | Earthquake | Sudden movement of the Earth's crust | Physical sciences | 0 | 0 | 0 |
| 294 |  | Eclipse | Astronomical event where one body is hidden by another | Physical sciences | 0 | 0 | 0 |
| 295 |  | Ecliptic | Apparent path of the Sun on the celestial sphere | Physical sciences | 0 | 0 | 0 |
| 296 |  | Eddy current | Loops of electric current induced within conductors by a changing magnetic field | Physical sciences | 0 | 0 | 0 |
| 297 |  | El Niño–Southern Oscillation | Global climate phenomenon | Physical sciences | 0 | 0 | 0 |
| 298 | Elastic modulus | Physical property that measures stiffness of material | Physical sciences | 0 | 0 | 0 | |
| 299 | Elasticity (physics) | Physical property when materials or objects return to original shape after deformation | Physical sciences | 0 | 0 | 0 | |
| 300 |  | Electric charge | Electromagnetic property of matter | Physical sciences | 0 | 0 | 0 |
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