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English Wikipedia references for Nasa.gov 51-100 of 26570
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| Bakelite Bakelite () is a material based on the thermosetting phenol formaldehyde resin polyoxybenzylmethylenglycolanhydride, developed in 1907–1909 by Belgian Dr. Leo Baekeland. Formed by the reaction under heat and pressure of phenol (a toxic, colourless crystalline solid) and formaldehyde (a simple organic compound), generally with a wood flour filler, it was the first plastic made from synthetic components. Bakelite | |
| Boeing 747 Boeing_747 | |
| Black hole In general relativity, a black hole is a region of space in which the gravitational field is so powerful that nothing, including light, can escape its pull. The black hole has a one-way surface, called an event horizon, into which objects can fall, but out of which nothing can come. It is called "black" because it absorbs all the light that hits it, reflecting nothing, just like a perfect blackbody in thermodynamics. Quantum analysis of black holes shows them to possess a temperature and Hawking radiation. Black_hole | |
| Babylon 5 Babylon 5 is an American science fiction television series created, produced and largely written by J. Michael Straczynski. The show centers on the Babylon 5 space station:story arcs, the series was often described as a "novel for television."The pilot film premiered on February 22, 1993. Babylon_5 | |
| B-1 Lancer B-1_Lancer | |
| STS-51-F STS-51-F (Spacelab 2) was the eighth flight of Space Shuttle Challenger, and the nineteenth shuttle flight. The payload with most publicity was the Carbonated Beverage Dispenser Evaluation, which was an experiment where both Coca-Cola and Pepsi tried to make their drinks available to astronauts. Both fizzed excessively in the low cabin pressure.. STS-51-F | |
| Chemical equilibrium In a chemical process, chemical equilibrium is the state in which the chemical activities or concentrations of the reactants and products have no net change over time. Usually, this would be the state that results when the forward chemical process proceeds at the same rate as their reverse reaction. Chemical_equilibrium | |
| Calendar calendar is a system of organizing days for social, religious, commercial, or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. The name given to each day is known as a date. Periods in a calendar (such as years and months) are usually, though not necessarily, synchronized with the cycles of some astronomical phenomenon, such as the cycle of the sun or the moon. Calendar | |
| Physical cosmology Physical cosmology, as a branch of astronomy, is the study of the largest-scale structures and dynamics of our universe and is concerned with fundamental questions about its formation and evolution. Cosmology involves itself with studying the motions of the celestial bodies and the first cause. Physical_cosmology | |
| Inflation (cosmology) In physical cosmology, cosmic inflation, cosmological inflation or just inflation is the theorized exponential expansion of the universe at the end of the grand unification epoch, 10-36 seconds after the Big Bang, driven by a negative-pressure vacuum energy density. The term "inflation" is also used to refer to the hypothesis that inflation occurred, to the theory of inflation, or to the inflationary epoch. Inflation_(cosmology) | |
| Combustion Combustion or burning is a complex sequence of exothermic chemical reactions between a fuel (usually a hydrocarbon) and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames, appearance of light flickering.Direct combustion by atmospheric oxygen is a reaction mediated by radical intermediates. Combustion | |
| Catherine Coleman Catherine Grace "Cady" Coleman (born December 14, 1960, in Charleston, South Carolina) is a colonel in the United States Air Force and a NASA astronaut. She is a veteran of two Space Shuttle missions. Catherine_Coleman | |
| Cretaceous–Tertiary extinction event Talk:Cretaceous–Tertiary_extinction_event | |
| Carbon dioxide Carbon dioxide (chemical formula:chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state.Carbon dioxide is used by plants during photosynthesis to make sugars which may either be consumed again in respiration or used as the raw material to produce polysaccharides such as starch and cellulose, proteins and the wide variety of other organic compounds required for plant growth and development. Carbon_dioxide | |
| Comet A comet is a Small Solar System Body that orbits the Sun. When close enough to the Sun, a comet exhibits a visible coma (fuzzy "atmosphere"), and sometimes a tail, both because of the effects of solar radiation upon the comet's nucleus. Comet nuclei are themselves loose collections of ice, dust and small rocky particles, ranging from a few kilometers to tens of kilometers across. Comet | |
| Continental drift Continental drift is the movement of the Earth's continents relative to each other. The hypothesis that continents 'drift' was first put forward by Abraham Ortelius in 1596 and was fully developed by Alfred Wegener in 1912. However, it was not until the development of the theory of plate tectonics in the 1960s, that a sufficient geological explanation of that movement was found. Continental_drift | |
| Common Era Common Era, abbreviated as CE, is a designation for the calendar system most commonly used world-wide for numbering the year part of the date. The numbering of years using Common Era notation is identical to the numbering used with Anno Domini (BC/AD) notation, being the current year in both notations and neither using a year zero. Common_Era | |
| Chuck Yeager Charles Elwood "Chuck" Yeager (born February 13, 1923) is a former brigadier general in the United States Air Force and noted test pilot. In 1947, he became the first pilot (at age 24) to travel faster than sound. Originally retiring as a brigadier general, Yeager was promoted to major general on the Air Force's retired list 20 years later for his military achievements.His career began in World War II as a private in the U.S. Chuck_Yeager | |
| Cosmic ray Talk:Cosmic_ray | |
| Camelopardalis Camelopardalis ( Camélopárdalis, genitive the same), from Greek καμηλοπάρδαλις (Greeks thought that it had the head of a camel and the spots of a leopard), is a large but faint constellation in the northern sky. Its name is Latin for giraffe. The constellation was first described by Jakob Bartsch in 1624, but was probably created earlier by Petrus Plancius. In older astronomy books, one will sometimes see an alternative spelling of the name as Camelopardus. Camelopardalis | |
| Ceuta Ceuta is an autonomous city of Spain located on the North African side of the Strait of Gibraltar, on the Mediterranean, which separates it from the Spanish mainland. The area of Ceuta is approximately 28 km².Ceuta is dominated by a hill called Monte Hacho, on which there is a fort used by the Spanish Army. Monte Hacho is one of the possible locations for the southern of the Pillars of Hercules of Greek legend, the other possibility being Jebel Musa. Ceuta | |
| Current events/Archive 3 Talk:Current_events/Archive_3 | |
| Clyde Tombaugh Clyde William Tombaugh (February 4, 1906 American astronomer. Tombaugh is best known for discovering the dwarf planet Pluto in 1930, but also discovered many asteroids, and called for serious scientific research of unidentified flying objects. Clyde_Tombaugh | |
| Christchurch Talk:Christchurch | |
| Comet Shoemaker-Levy 9 Shoemaker-Levy redirects here. For other Shoemaker-Levy comets see List of periodic comets.Comet Shoemaker-Levy (SL9, formally designated D/1993) was a comet that collided with Jupiter in 1994, providing the first direct observation of an extraterrestrial collision of solar system objects. Comet_Shoemaker-Levy_9 | |
| Comet Talk:Comet | |
| Carl Sagan Carl Edward Sagan, Ph.D. (November 9, 1934 – December 20, 1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI). Carl_Sagan | |
| Cryptozoology Talk:Cryptozoology | |
| Chinese calendar The Chinese calendar is lunisolar, incorporating elements of a lunar calendar with those of a solar calendar. It is not exclusive to China, but followed by many other Asian cultures. It is often referred to by the Western cultures as the Chinese calendar because it was first perfected by the Chinese around 500 BC . Chinese_calendar | |
| Carme (moon) Carme_(moon) | |
| Comet Hale-Bopp Comet_Hale-Bopp | |
| Comet Hale-Bopp Talk:Comet_Hale-Bopp | |
| Hypothetical types of biochemistry hypothetical types of biochemistry are the different types of speculative biochemistries of alien life forms that differ radically from those known on Earth. It includes biochemistries that use elements other than carbon to construct primary cellular structures and/or use solvents besides water.Theories about extraterrestrial life based on these "alternative" biochemistries are common in science fiction. Hypothetical_types_of_biochemistry | |
| Cosmic microwave background radiation In cosmology, cosmic microwave background (CMB) radiation (also CMBR, CBR, MBR, and relic radiation) is a form of electromagnetic radiation filling the universe. With a traditional optical telescope, the space between stars and galaxies (the background) is pitch black. Cosmic_microwave_background_radiation | |
| Cosmic microwave background radiation Talk:Cosmic_microwave_background_radiation | |
| Centrifugal force (rotating reference frame) In classical mechanics, centrifugal force is an outward force associated with curved motion, that is, rotation about some (possibly not stationary) center. Centrifugal force is one of several so-called pseudo-forces (also known as inertial forces), so named because, unlike fundamental forces, they do not originate in interactions with other bodies situated in the environment of the particle upon which they act. Centrifugal_force_(rotating_reference_frame) | |
| Centripetal force Centripetal force is a force that makes a body follow a curved, as opposed to straight, path; it is always directed orthogonal to the velocity of the body, toward the instantaneous center of curvature of the path. The term centripetal force comes from the Latin Centripetal_force | |
| Casimir effect physics, the Casimir effect and the Casimir-Polder force are physical forces arising from a quantized field. The typical example is of two uncharged metallic plates in a vacuum, placed a few micrometers apart, without any external electromagnetic field. In a classical description, the lack of an external field also means that there is no field between the plates, and no force would be measured between them. Casimir_effect | |
| Coriolis effect In physics, the Coriolis effect is an apparent deflection of moving objects when they are viewed from a rotating reference frame. Coriolis_effect | |
| Caribbean Sea Caribbean Sea is a sea of the Atlantic Ocean situated in the tropics of the Western hemisphere, bounded to the south and west by the American landmass, with the North Atlantic Ocean proper to the northeast and the Gulf of Mexico to the northwest. More specifically, it washes upon (clockwise from the south) the South American countries of Venezuela and Colombia on the south; the Central American countries of Panama on the southwest, and Costa Rica, Nicaragua, Honduras, Guatemala, Belize, and Mexico on the west; the Greater Antilles (Cuba, Jamaica, Hispaniola, and Puerto Rico) on the north, and the Lesser Antilles on the east. Caribbean_Sea | |
| Corona A corona is a type of plasma "atmosphere" of the Sun or other celestial body, extending millions of kilometers into space, most easily seen during a total solar eclipse, but also observable in a coronagraph. The Latin root of the word corona means crown. Corona | |
| Dune In physical geography, a dune is a hill of sand built by aeolian processes. Dunes are subject to different forms and sizes based on their interaction with the wind. Most kinds of dune are longer on the windward side where the sand is pushed up the dune, and a shorter "slip face" in the lee of the wind. The "valley" or trough between dunes is called a slack. A "dune field" is an area covered by extensive sand dunes. Large dune fields are known as ergs. Dune | |
| Deforestation Deforestation is the logging and/or burning of trees in the forested area. There are several reasons for doing socharcoal can be sold as a commodity and used by humans, while cleared land is used as pasture, plantations of commodities and human settlement. The removal of trees without sufficient reforestation has resulted in damage to habitat, biodiversity loss and aridity. Deforested regions often degrade into wasteland. Deforestation | |
| Desertification Desertification is the degradation of land in arid and dry sub-humid areas, resulting primarily from man-made activities and influenced by climatic variations. It is principally caused by overgrazing, overdrafting of groundwater and diversion of water from rivers for human consumption and industrial use, all of these processes fundamentally driven by overpopulation. Desertification | |
| Dorado Dorado (, genitive Doradus ) is a constellation in the southern sky, created in the sixteenth century and now one of the 88 modern constellations. Its name refers to the dolphinfish (Coryphaena hippurus), which is known as dorado in Spanish, although it has also been depicted as a swordfish in the past. Dorado is notable for containing most of the Large Magellanic Cloud, the remainder being in the constellation Mensa. The South Ecliptic Pole also lies within this constellation. Dorado | |
| Data set A data set (or dataset) is a collection of data, usually presented in tabular form. Each column represents a particular variable. Each row corresponds to a given member of the data set in question. It lists values for each of the variables, such as height and weight of an object or values of random numbers. Each value is known as a datum. The data set may comprise data for one or more members, corresponding to the number of rows. Data_set | |
| Dyson sphere A Dyson sphere (or shell as it appeared in the original paper) is a hypothetical megastructure originally described by Freeman Dyson. Such a "sphere" would be a system of orbiting solar power satellites meant to completely encompass a star and capture most or all of its energy output. Dyson_sphere | |
| Dark matter In astronomy and cosmology, dark matter is hypothetical matter that is undetectable by its emitted radiation, but whose presence can be inferred from gravitational effects on visible matter. Dark matter is postulated to explain the flat rotation curves of spiral galaxies and other evidence of "missing mass" in the universe. Dark_matter | |
| ΔT ΔT, Delta T, delta-T, deltaT, or DT is the time difference obtained by subtracting Universal Time from Terrestrial Time.Universal Time (UT) is a time scale based on the Earth's rotation, which is somewhat irregular over short periods (days up to a century), thus any time based on it cannot have an accuracy better than 1 8. ΔT | |
| Drake equation The Drake equation (also sometimes called the "Green Bank equation," the "Green Bank Formula," or erroneously labeled the "Sagan equation") is a famous result in the fields of exobiology and the search for extraterrestrial intelligence (SETI).This equation was devised by Dr. Drake_equation |
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