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#ThingDescriptionTopicForAgainstNet
1AerosolSuspension of fine solid particles or liquid droplets in a gasPhysical sciences10+1
2AmideOrganic compounds of the form RC(=O)NR′R″Physical sciences10+1
3BosonClass of subatomic particlePhysical sciences10+1
4Canis MajorConstellation in the southern celestial hemispherePhysical sciences10+1
5CarbonChemical element with atomic number 6 (C)Physical sciences10+1
6ColloidMixture of an insoluble substance microscopically dispersed throughout another substancePhysical sciences10+1
7Electrical networkAssemblage of connected electrical elementsPhysical sciences10+1
8FrequencyNumber of occurrences or cycles per unit timePhysical sciences10+1
9GeyserNatural explosive eruption of hot waterPhysical sciences10+1
10MeteoriteSolid debris from outer space that hits a planetary surfacePhysical sciences10+1
11Minor planetAstronomical object that is neither a planet nor a cometPhysical sciences10+1
12NatureMaterial world and its phenomenaPhysical sciences10+1
13NeptuneEighth planet from the SunPhysical sciences10+1
14SnowPrecipitation in the form of ice crystal flakesPhysical sciences10+1
15SuperclusterLarge group of smaller galaxy clusters or galaxy groupsPhysical sciences10+1
16Wave functionMathematical description of quantum statePhysical sciences10+1
173C 273Brightest quasar from Earth located in the constellation VirgoPhysical sciences000
18Absolute zeroLowest theoretical temperaturePhysical sciences000
19Absorption spectroscopySpectroscopic techniques that measure the absorption of radiationPhysical sciences000
20Abyssal plainFlat area on the deep ocean floorPhysical sciences000
21AccelerationRate of change of velocityPhysical sciences000
22Accuracy and precisionMeasures of observational errorPhysical sciences000
23Acetic acidChemical acid found in vinegarPhysical sciences000
24AcetoneOrganic compound ((CH3)2CO); simplest ketonePhysical sciences000
25AcidChemical compound giving a proton or accepting an electron pairPhysical sciences000
26Acid rainRain that is unusually acidicPhysical sciences000
27Acid–base reactionChemical reaction between an acid and a basePhysical sciences000
28AcousticsBranch of physics involving mechanical wavesPhysical sciences000
29AcreUnit of areaPhysical sciences000
30ActinideF-block chemical elementsPhysical sciences000
31ActiniumChemical element with atomic number 89 (Ac)Physical sciences000
32Active galactic nucleusCompact region at a galaxy's center with abnormally high luminosityPhysical sciences000
33Aeolian processesProcesses due to wind activityPhysical sciences000
34AerodynamicsBranch of dynamics concerned with studying the motion of airPhysical sciences000
35Air massVolume of air defined by its temperature and water vapor contentPhysical sciences000
36AlbedoRatio of how much light is reflected back from a bodyPhysical sciences000
37AlchemyBranch of natural philosophyPhysical sciences000
38Alcohol (chemistry)Organic compound with at least one hydroxyl (–OH) groupPhysical sciences000
39AldehydeOrganic compound containing the functional group R–CH=OPhysical sciences000
40Alkali metalGroup of highly reactive chemical elementsPhysical sciences000
41Alkaline earth metalGroup of chemical elementsPhysical sciences000
42AlkaneType of saturated hydrocarbon compoundPhysical sciences000
43AlkeneHydrocarbon compound containing one or more C=C bondsPhysical sciences000
44AlkyneHydrocarbon compound containing one or more C≡C bondsPhysical sciences000
45AllotropyProperty of some chemical elements to exist in two or more different formsPhysical sciences000
46AlloyMixture or metallic solid solution composed of two or more elementsPhysical sciences000
47Alluvial fanFan-shaped deposit of sedimentPhysical sciences000
48Alpha CentauriStar system in the Centaurus constellationPhysical sciences000
49Alpha particleIonizing radiation particle of two protons and two neutronsPhysical sciences000
50Alternating currentElectric current that periodically reverses directionPhysical sciences000

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Item list from Wikipedia Vital Articles (levels 1-4), refreshed daily at 06:00 UTC. Text & images CC BY-SA.