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In science, the term natural science refers to a rational approach to the study of the universe, which is understood as obeying rules or laws of natural origin. The term 'natural science' is also used to distinguish those fields that use the scientific method to study nature from the social sciences, which use the scientific method to study human behavior and society; and from the formal sciences, such as mathematics and logic, which use a different methodology.

Physical science is an encompassing term for the branches of natural science, and science, that study non-living systems, in contrast to the biological sciences. However, the term "physical" creates an involuntary, somewhat arbitrary distinction, since many branches of physical science also study biological phenomena.

Natural and physical sciences: OverviewListsOutlinesPortalsCategoriesGlossariesIndexes

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Main articles: Natural science and Nature   See also Science, Scientific method, Scientist, Scientific misconduct, and Fields of science

Biology Anatomy (Human anatomy) • Astrobiology • Biochemistry • Bioinformatics • Biological anthropology • Biophysics • Botany • Cell biology • Computational biology • Developmental biology • Ecology • Evolutionary biology • Genetics (Molecular genetics, Population genetics) • Genomics • Marine biology • Histology • Human biology • Immunology • Microbiology • Molecular biology • Neuroscience • Origin of life • Paleontology • Parasitology • Pathology • Physiology • Taxonomy • Zoology (Ethology)

Physical sciences Earth science • Systems theory

Astronomy – Radio astronomy
Chemistry  Analytical chemistryAtomic theoryBiochemistryChemical bondChemical equilibriumChemical industryChemical lawsChemical reactionChemical formulasChemistsElectrochemistryEnergyHistory of chemistryInorganic compoundsMaterials scienceIonPeriodic tablepHPhasePolymer chemistryRedoxThermochemistry
MatterAtomCompoundMoleculeSubstance (Acid, Base)
Chemical elements – ActiniumAluminiumAmericiumAntimonyArgonArsenicAstatineBariumBerkeliumBerylliumBismuthBohriumBoronBromineCadmiumCaesiumCalciumCaliforniumCarbonCeriumChlorineChromiumCobaltCoperniciumCopperCuriumDarmstadtiumDubniumDysprosiumEinsteiniumErbiumEuropiumFermiumFluorineFranciumGadoliniumGalliumGermaniumGoldHafniumHassiumHeliumHolmiumHydrogenIndiumIodineIridiumIronKryptonLanthanumLawrenciumLeadLithiumLutetiumMagnesiumManganeseMeitneriumMendeleviumMercuryMolybdenumNeodymiumNeonNeptuniumNickelNiobiumNitrogenNobeliumOsmiumOxygenPalladiumPhosphorusPlatinumPlutoniumPoloniumPotassiumPraseodymiumPromethiumProtactiniumRadiumRadonRheniumRhodiumRoentgeniumRubidiumRutheniumRutherfordiumSamariumScandiumSeaborgiumSeleniumSiliconSilverSodiumStrontiumSulfurTantalumTechnetiumTelluriumTerbiumThalliumThoriumThuliumTinTitaniumTungstenUnunhexiumUnunoctiumUnunpentiumUnunquadiumUnunseptiumUnuntriumUraniumVanadiumXenonYtterbiumYttriumZincZirconium
PhysicsAtomAtomic nucleusElementary particleForceGravitationMassMatterOpticsPhaseQuantum mechanicsSoundSpeedTimeWeightEnergyRadiationElectromagnetic radiationVisible spectrumSpecial relativityGeneral relativityElectromagnetismStandard ModelClassical mechanicsUnsolved problems in physics

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Science – systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the world. An older and closely related meaning still in use today is that of Aristotle, for whom scientific knowledge was a body of reliable knowledge that can be logically and rationally explained.

Basis of natural science – natural science is a major branch of science, that tries to explain and predict nature's phenomena, based on empirical evidence. In natural science, hypotheses must be verified scientifically to be regarded as scientific theory. Validity, accuracy, and social mechanisms ensuring quality control, such as peer review and repeatability of findings, are amongst the criteria and methods used for this purpose.

  • Scientific method – body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry must be based on gathering empirical and measurable evidence subject to specific principles of reasoning.
  • Big Science
  • Metric system – decimal based system of measurement based on the metre and the kilogram, units of measure that were developed in France in 1799 and which is now used in most branches on international commerce, science and engineering.

Branches of natural science – also called "the natural sciences", which are:

  • Biology – study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy.
    • Biological phenomena
      • Death – cessation of life; end of life-cycle
    • Branches of biology
      • Anatomy – study of the structure of living things.
        • Human nervous system – part of the human body that coordinates a person's voluntary and involuntary actions and transmits signals between different parts of the body.
          • Human brain – central organ of the nervous system located in the head of a human being, protected by the skull
      • Biochemistry – study of substances found in biological organisms.
      • Biophysics – interdisciplinary science that uses the methods of physical science to study biological systems. Studies included under the branches of biophysics span all levels of biological organization, from the molecular scale to whole organisms and ecosystems.
      • Botany – study of plant life.
      • Cell biology – study of cells. Their physiological properties, their structure, the organelles they contain, interactions with their environment, their life cycle, division and death.
      • Ecology – study of interactions between organisms and their environment.
      • Environmental studies – multidisciplinary academic field that systematically studies human interaction with the environment, bringing together principles of the physical sciences, commerce/economics and social sciences to solve today's complex contemporary environmental problems.
      • Evolution – study of evolutionary processes that produced the diversity of life on Earth.
      • Genetics – study of genes, heredity, and variation in living organisms.
      • Immunology – study of immune systems in all organisms.
      • Neuroscience – scientific study of the nervous system.
        • Brain mapping – neuroscience techniques for making spatial maps of the (human or non-human) brain.
      • Paleontology – study of prehistoric life, including organisms' evolution and interactions with each other and their environments (their paleoecology).
        • Dinosaurs – diverse group of animals that were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period (about 230 million years ago) until the end of the Cretaceous (about 65 million years ago), when the Cretaceous–Paleogene extinction event led to the extinction of most dinosaur species at the close of the Mesozoic era.
      • Pharmacology – broadly defined as the study of drug action and pharmacokinetics.
      • Physiology – study of how living organisms function.
      • Zoology – study of the animal kingdom, including the structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct.
    • Life forms – living organisms
      • Animals – multicellular, eukaryotic organisms of the kingdom Animalia (also called Metazoa). All animals are motile, meaning they can move spontaneously and independently at some point in their lives. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their lives. All animals are heterotrophs: they must ingest other organisms or their products for sustenance.
        • Ants – more than 12,000 species of social insects evolved from wasp-like ancestors, that live in organised colonies which may consist of millions of ants.
        • Gastropods
        • Birds – feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are about 10,000 living species of birds.
        • Fish – any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits.
          • Sharks – type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago.
      • Fungi – group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms.
  • Physical sciences – encompasses the branches of science that study non-living systems, in contrast to the life sciences. However, the term "physical" creates an unintended, somewhat arbitrary distinction, since many branches of physical science also study biological phenomena.
    • Chemistry – study of matter, especially its properties, structure, composition, behavior, reactions, interactions and the changes it undergoes.
      • Organic chemistry – study of the structure, properties, composition, reactions, and preparation (by synthesis or by other means) of carbon-based compounds, hydrocarbons, and their derivatives.
      • Water – chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state (water vapor or steam).
    • Earth science – all-embracing term for the sciences related to the planet Earth. It is arguably a special case in planetary science, the Earth being the only known life-bearing planet.
      • Earth – planet you are on right now. Third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life.
      • Geography – study of the Earth and its lands, features, inhabitants, and phenomena. A literal translation would be "to describe or write about the Earth".
      • Geology – study of the Earth, with the general exclusion of present-day life, flow within the ocean, and the atmosphere. The field of geology encompasses the composition, structure, physical properties, and history of Earth's components, and the processes by which they are shaped. Geologists typically study rock, sediment, soil, rivers, and natural resources.
      • Geophysics – physics of the Earth and its environment in space; also the study of the Earth using quantitative physical methods. Includes Earth's shape; its gravitational and magnetic fields; its internal structure and composition; its dynamics and their surface expression in plate tectonics, the generation of magmas, volcanism and rock formation.
      • Meteorology – study of the atmosphere, including study and forecasting of the weather.
        • Tropical cyclones – storm systems characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain.
    • Physics – study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.
      • Energy – scalar physical quantity that describes the amount of work that can be performed by a force. Energy is an attribute of objects and systems that is subject to a conservation law.
    • Space science
      • Astronomy – study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation).
        • Solar System – gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Where the Earth is located (the third planet orbiting the Sun).
          • Mercury – closest planet to the sun.
          • Venus – second closest planet to the sun. It is a terrestrial planet.
          • Earth – home of the human race, and 3rd planet closest to the sun. It is the only planet known to support life.
            • Moon – astronomical object that orbits planet Earth, being Earth's only permanent natural satellite.
          • Mars – terrestrial planet. Fourth closest planet to the sun.
          • Jupiter – gas giant, and fifth planet from the sun.
          • Saturn – gas giant, famous for its rings, and sixth planet from the sun.
          • Uranus – ice giant, and seventh planet from the sun.
          • Neptune – ice giant. Eighth and furthest planet from the sun.
        • Black holes – mathematically defined region of spacetime exhibiting such a strong gravitational pull that no particle or electromagnetic radiation can escape from it.
        • Galaxies – gravitationally bound systems of stars, stellar remnants, interstellar gas, dust, and dark matter. Earth is located in the Milky Way galaxy.

List of sciences • Superseded scientific theories

Biology  • Biological journalsCauses of deathFeeding behavioursHuman anatomyMusclesProtective human featuresGene familiesLatin and Greek words commonly used in systematic names

Species and specimens – The World's 25 Most Endangered PrimatesDomesticated animalsList of dinosaursGenera in CaesalpinioideaeGenera in FaboideaeGenera in MimosoideaeQuercus species (oak) • Smilax speciesBirds by region • Mammals by region • Utricularia speciesCryptids
Plants • Arecaceae Genera (palm tree family) • Acer species (maple) • Sequoia grovesDomesticated plantsEdible seedsFamous treesFlowersFruitsGarden plantsHerbsVegetables
Insects • Insects recorded in Britain
Fish • Fish in Sweden
Diseases – Banana and plantain diseasesSweet potato diseases

Physical science

TelescopesTelescope typesOptical telescopesLargest optical refracting telescopesLargest optical reflecting telescopesLargest optical telescopes historicallySpace telescopesX-ray space telescopesProposed space observatoriesAstronomical interferometers at visible and infrared wavelengthsLargest infrared telescopesSolar telescopesHighest astronomical observatories
Astronomical objectsConstellationsConstellations by areaExtrasolar planetsSupernovaeSupernova remnantsBrown dwarfsGamma-ray burstsBlack holesVoidsMost distant astronomical object record holdersAstronomical objects named after peopleInterstellar and circumstellar molecules
ObjectsMassRadiusSizeGravitationally roundedMeteor showersMoonsTallest mountainsGeological featuresLargest lakes and seasExtraterrestrial volcanoesMinor planetsMinor planet moonsTrans-Neptunian objectsUnnumbered minor planetsPossible dwarf planetsComets by typeNumbered cometsExtremesObjects at Lagrangian pointsHypothetical objects
MercuryMercury-crossing asteroidsGeological featuresCratersAlbedo features
VenusVenus-crossing asteroidsMountainsGeological featuresCratersTerraeCoronae
MoonCratersFeaturesMountainsmountains by hightMariaValleysLists of eclipses
MarsMars-crossing asteroidsRocksCratersMountainsMountains by heightVallesMeteoritesAreas of chaos terrainChasmataCatenaePlainsTerraeLabes
Geological features on PhobosGeological features on Deimos
AsteroidsNoteworthy asteroidsAten asteroidsApollo asteroidsAmor asteroidsApohele asteroidsTrojan asteroidsAsteroids with moonsCentaursScattered-disk objectsAsteroids named after important peopleExceptional asteroidsNear-Earth asteroids by distance from SunAsteroid groups
JupiterJupiter-crossing asteroidsMoonsJupiter trojans (Trojan campJupiter trojans (Greek camp)Events
geological features on Jupiter's inner moonsgeological features on Jupiter's smaller moons
IoMountains on IoGeological featuresVolcanic features
EuropaGeological featuresCraters
GanymedeGeological featuresCraters
CallistoGeological featuresCraters
SaturnSaturn-crossing asteroidsGeological features on Saturn's smaller moonsGeological features on MimasGeological features on EnceladusGeological features on TethysGeological features on DioneGeological features on RheaGeological features on Iapetus
UranusUranus-crossing asteroidsGeological features on PuckGeological features on MirandaGeological features on ArielGeological features on TitaniaGeological features on OberonCraters on Umbriel
NeptuneNeptune-crossing asteroidsMoonsCraters on Triton
StarsBy constellationBrightestNearest brightMost luminousMost massiveLargestHottestLeast massiveNearestTraditional star namesArabic star namesChinese star namesNamed after peopleVariableSemiregular variableWith proplydsX-ray pulsars
NebulaeDark nebulaeDiffuse nebulaePlanetary nebulaeProtoplanetary nebulae
Star clustersGlobular clustersOpen clustersStellar streams
Galaxiesnearest galaxiesgalaxies named after peopleSpiral galaxiespolar-ring galaxiesquasars
Other astronomical listsAstronomical cataloguesAstronomical symbolsAstronomical societiesFuture astronomical eventsAstronomical instrumentsAstronomical instrument makers
Chemistry  • BiomoleculesCompoundsEnthalpy change of formationFunctional groupsIsotope table (divided)Isotope table (complete)Stable isotopesStandard electrode potentials
Elementsby numberby symbol Periodic table
Earth sciences
Geology  • BirthstonesEarthquakesLandformsMineralsOil fieldsUranium minesPlate tectonicsRocksTectonic platesVolcanoesGlobal Boundary Stratotype Sections and Points
Meteorology • Tropical cyclone names
Physics  • Artificial Radiation BeltsColorsCyclesEquations in classical mechanicsLaws in scienceLetters used in mathematics and scienceNoiseParticlesRelativistic equationsSatellites which have provided data on the magnetosphereResistivities

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History of Science • Philosophy of science • Systems science

Biological science

Agropedia • Amphibians and Reptiles • Animals • Arthropods • Astrobiology • Birds • Cats • Cetaceans • Crustaceans • Dinosaurs • Dogs • Ecology • Evolutionary biology • Extinct and Endangered Species • Fish • Forestry • Fungi • Gastropods • Horses • Insects  • Mammals • Marine life • Molecular Anthropology • Molecular and Cellular Biology (Metabolism, Gene wiki) • Neuroscience • Paleontology • Plants • Primates • Prehistoric mammals • Rabbits and hares • Sharks • Trees • Turtles • Viruses • Wildlife of Scotland • Wetlands

Physical science

Astronomy (Space, Solar System, Mars, Moon, Uranus, Jupiter, Star, X-ray astronomy

Chemistry (Analytical chemistry, Organic chemistry, Physical chemistry, Crystallography

Earth sciences (Atmospheric sciences, Earthquakes, Environment, Fire, Global warming, Tropical cyclones, Volcanoes and Volcanology, Weather, Water

Physics (Cosmology, Gravitation, Electromagnetism)

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