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English Wikipedia references for Nasa.gov 251-300 of 26570
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| Planet A planet (from Greek , from the verb planōmai I wander), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals. Planet | |
| Primate A primate (, ) is a member of the biological order Primates ( Primate | |
| Pliocene The Pliocene epoch (spelled Pleiocene in older texts) is the period in the geologic timescale that extends from 5.332 million to 2.588 million years before present.The Pliocene is the second and youngest epoch of the Neogene period in the Cenozoic era. The Pliocene follows the Miocene epoch and is followed by the Pleistocene epoch. Pliocene | |
| Proton Proton | |
| Pitcairn Islands The Pitcairn Islands (; Pitkern:Pitkern Ailen), officially named the Pitcairn, Henderson, Ducie and Oeno Islands, are a group of four volcanic islands in the southern Pacific Ocean. The islands are a British overseas territory (formerly a British colony), the last remaining in the Pacific. The names of the islands are Pitcairn, Henderson, Ducie, and Oeno; only Pitcairn, the second largest, is inhabited. Pitcairn_Islands | |
| Military of Puerto Rico Puerto Rico is the responsibility of the United States as part of the Treaty of Paris (1898).A branch of the Air National Guard is stationed in Puerto Rico, known as the Puerto Rico Air National Guard (PRANG). It has formerly been equipped with aircraft such as the F-104 Starfighter, A-7 Corsair II, F-16, and the PRANG currently flies only C-130 Hercules airplanes. Military_of_Puerto_Rico | |
| Pressure Pressure (symbol or sometimes ) is the force per unit area applied to an object in a direction perpendicular to the surface. Gauge pressure is the pressure relative to the local atmospheric or ambient pressure. Pressure | |
| Punctuation Punctuation is everything in written language other than the actual letters or numbers, including punctuation marks (listed at right), inter-word spaces, and indentation.Punctuation marks are symbols that correspond to neither phonemes (sounds) of a language nor to lexemes (words and phrases), but which serve to indicate the structure and organization of writing, as well as intonation and pauses to be observed when reading it aloud. See orthography. Punctuation | |
| Planets beyond Neptune "Ninth planet" and "Tenth planet" redirect here. for other uses see Ninth planet (disambiguation) and Tenth planet (disambiguation)Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century but culminated at the start of the 20th with Percival Lowell's quest for Planetorbits of the gas giants, particularly Uranus and Neptune, Planets_beyond_Neptune | |
| Paraffin In chemistry, paraffin is the common name for the alkane hydrocarbons with the general formula CnH2n+2. Paraffin wax refers to the solids with 20 ≤ n ≤ 40 .The simplest paraffin molecule is that of methane, CH4, a gas at room temperature. Heavier members of the series, such as that of octane C8H18, appear as liquids at room temperature. The solid forms of paraffin, called paraffin wax, are from the heaviest molecules from C20H42 to C40H82. Paraffin wax was identified by Carl Reichenbach in 1830. Paraffin | |
| Project management Project management is the discipline Project_management | |
| Polar bear Polar_bear | |
| Physics and Star Trek The science-fiction media franchise Star Trek has borrowed freely from the scientific world to provide storylines. Episodes are replete with references to tachyon beams, baryon sweeps, quantum fluctuations and event horizons. Many of the technologies "created" for the Star Trek universe were done so out of simple economic necessity transporter was created because the budget of the original series in the 1960s did not allow for expensive shots of spaceships landing on planets. Physics_and_Star_Trek | |
| Impulse drive Star Trek universe, the impulse drive is the method of propulsion that starships and other spacecraft use when they are travelling below the speed of light. Typically powered by nuclear fusion reactions, impulse engines let ships travel interplanetary distances readily. Impulse_drive | |
| Po River Po_River | |
| P-51 Mustang P-51_Mustang | |
| P-51 Mustang Talk:P-51_Mustang | |
| Planetary ring planetary ring is a ring of cosmic dust and other small particles orbiting around a planet in a flat disc-shaped region. those around Saturn, but the other three gas giants of the solar system (Jupiter, Uranus and Neptune) possess ring systems of their own.Recent reports have suggested that the Saturnian moon Rhea may have its own tenuous ring system, which would make it the only moon known to possess a ring system. Planetary_ring | |
| Permian–Triassic extinction event The Permian–Triassic (P–Tr) extinction event, informally known as the Great Dying, was an extinction event that occurred , Permian–Triassic_extinction_event | |
| Plate tectonics Plate tectonics (from the Greek τέκτων; tektōn, meaning "builder" or "mason") describes the large scale motions of Earth's lithosphere. The theory encompasses the older concepts of continental drift, developed during the first decades of the 20th century by Alfred Wegener, and seafloor spreading, understood during the 1960s.The outermost part of the Earth's interior is made up of two layers Above is the lithosphere, consisting of the crust and the rigid uppermost part of the mantle. Plate_tectonics | |
| Plate tectonics Talk:Plate_tectonics | |
| Pioneer 11 Pioneer 11 (also called Pioneer G) was the second mission of the Pioneer program (after its sister probe Pioneer 10) to investigate Jupiter and the outer solar system and the first to explore Saturn and its main rings. Pioneer 11 used Jupiter's mass in a gravity assist to alter its trajectory toward Saturn. The spacecraft made a successful Saturn flyby and then followed an escape trajectory from the solar system. Pioneer_11 | |
| Pioneer program Pioneer program is a series of United States unmanned space missions that was designed for planetary exploration. There were a number of such missions in the program, but the most notable were Pioneer 10 and Pioneer 11, which explored the outer planets and left the solar system. Both carry a golden plaque, depicting a man and a woman and information about the origin and the creators of the probes, should any extraterrestrials find them someday. Pioneer_program | |
| P-38 Lightning P-38_Lightning | |
| Pitot tube A pitot ( Pitot_tube | |
| Peenemünde Peenemünde () is a village in the northeast of the German (Western) part of Usedom island. It stands near the mouth(s) of the Peene river, on the easternmost part of the German Baltic coast. The area includes the 1992 , an Anchor Point of the European Route of Industrial Heritage. Special show-pieces are reproductions of the V-1 flying bomb and V-2 rocket, which were tested in the area during World War II. Peenemünde | |
| Quasar A quasi-stellar radio source (quasar) is a powerfully energetic and distant galaxy with an active galactic nucleus. Quasars were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light, that were point-like, similar to stars, rather than extended sources similar to galaxies. Quasar | |
| Robert A. Heinlein Robert Anson Heinlein (July 7 1907 – May 8 1988) was an American novelist and science fiction writer. Often called "the dean of science fiction writers," he is one of the most popular, influential, and controversial authors of the genre. He set a high standard for science and engineering plausibility and helped to raise the genre's standards of literary quality. Robert_A._Heinlein | |
| Richard Nixon Richard Milhous Nixon (January 9, 1913 37th President of the United States (1969–1974) and the only president to resign the office. He was also the 36th Vice President of the United States (1953Nixon was born in Yorba Linda, California. After completing undergraduate work at Whittier College, he graduated from Duke University School of Law in 1937 and returned to California to practice law in La Mirada. Richard_Nixon | |
| Richard Feynman Richard Phillips Feynman (; May 11, 1918 – February 15, 1988) was an American physicist known for the path integral formulation of quantum mechanics, the theory of quantum electrodynamics and the physics of the superfluidity of supercooled liquid helium, as well as work in particle physics (he proposed the parton model). Richard_Feynman | |
| Radon Radon () is a chemical element with symbol Rn and atomic number 86. Radon is a colorless, odorless, tasteless, naturally occurring, radioactive noble gas that is formed from the decay of radium. It is one of the heaviest substances that remains a gas under normal conditions and is considered to be a health hazard. Radon | |
| Robot A robot is a virtual or mechanical artificial agent. In practice, it is usually an electro-mechanical system which, by its appearance or movements, conveys a sense that it has intent or agency of its own. The word robot can refer to both physical robots and virtual software agents, but the latter are usually referred to as bots. There is no consensus on which machines qualify as robots, but there is general agreement among experts and the public that robots tend to do some or all of the following Robot | |
| Rice University Rice_University | |
| Red Red is any of a number of similar colors evoked by light consisting predominantly of the longest wavelengths of light discernible by the human eye, in the wavelength range of roughly 625–740 nm. Longer wavelengths than this are called infrared (below red), and cannot be seen by the naked human eye. Red is used as one of the additive primary colors of light, complementary to cyan, in RGB color systems. Red is also one of the subtractive primary colors of RYB color space but not CMYK color space. Red | |
| Robert Zubrin Robert Zubrin (born 19 April 1952) is an American aerospace engineer and author, best known for his advocacy of manned Mars exploration. He was the driving force behind Mars Direct—Martian atmosphere to produce oxygen, water, and rocket propellant for the surface stay and return journey. A modified version of the plan was subsequently adopted by NASA as their "design reference mission". Robert_Zubrin | |
| Rayleigh scattering Talk:Rayleigh_scattering | |
| Redshift In physics and astronomy, redshift occurs when electromagnetic radiation—usually visible light—emitted or reflected by an object is shifted towards the (less energetic) red end of the electromagnetic spectrum due to the Doppler effect. More generally, redshift is defined as an increase in the wavelength of electromagnetic radiation received by a detector compared with the wavelength emitted by the source. This increase in wavelength corresponds to a drop in the frequency of the Redshift | |
| Rocket A rocket or rocket vehicle is a missile, aircraft or other vehicle which obtains thrust by the reaction of the rocket to the ejection of fast moving fluid exhaust from a rocket engine. Chemical rockets create their exhaust by the combustion of rocket propellant. The action of the exhaust against the inside of combustion chambers and expansion nozzles accelerates the gas to extremely high speed and exerts a large reactive thrust on the rocket (since every action has an equal and opposite reaction). Rocket | |
| Rocket Talk:Rocket | |
| Ramjet Ramjet | |
| Rust Rust | |
| Sun The Sun () is the star at the center of the Solar System. The Earth and other matter (including other planets, asteroids, meteoroids, comets, and dust) orbit the Sun, which by itself accounts for about 98.6% of the Solar System's mass. The mean distance of the Sun from the Earth is approximately , and its light travels this distance in 8 minutes and 19 seconds. Sun | |
| South America South America is the southern continent of the Americas, situated entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. It is bordered on the west by the Pacific Ocean and on the north and east by the Atlantic Ocean; North America and the Caribbean Sea lie to the northwest.South America was named in 1580 by cartographers Martin Waldseemüller and Matthias Ringmann after Amerigo Vespucci, who was the first European to suggest that the Americas were not the East Indies, but a New World unknown to Europeans. South_America | |
| Star A star is a massive, luminous ball of plasma that is held together by gravity. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. Historically, the most prominent stars on the celestial sphere were grouped together into constellations, and the brightest stars gained proper names. Extensive catalogues of stars have been assembled by astronomers, which provide standardized star designations. Star | |
| Simon & Garfunkel Simon & Garfunkel is an American singer-songwriter duo consisting of Paul Simon and Art Garfunkel. They formed the group "Tom and Jerry" in 1957, and had their first taste of success with the minor hit "Hey, Schoolgirl." As Simon and Garfunkel, the duo rose to fame in 1965, backed by the hit single "The Sound of Silence." Their music was featured in the landmark film The Graduate, propelling them further into the public consciousness. Simon_&_Garfunkel | |
| Solar System Solar System consists of the Sun and those celestial objects bound to it by gravity, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. The Sun's retinue of objects circle it in a nearly flat disc called the ecliptic plane, most of the mass of which is contained within eight relatively solitary planets whose orbits are almost circular. Solar_System | |
| Starship Enterprise Enterprise or USS Enterprise (often referred to as the "Starship Enterprise") is the name of several fictional starships, some of which are the focal point for various television series and films in the Star Trek franchise created by Gene Roddenberry. The majority of these vessels share "NCC-1701" as part of their registry, with later ships appending a letter to the registry to differentiate them. Starship_Enterprise | |
| Sunspot sunspot is an area on the Sun's surface (photosphere) that is marked by intense magnetic activity, which inhibits convection, forming areas of reduced surface temperature. They can be visible from Earth without the aid of a telescope. Although they are at temperatures of roughly 4,000–4,500K, the contrast with the surrounding material at about 5,800black body (closely approximated by the photosphere) is a function of Telectric arc. Sunspot | |
| Supernova supernova (pl. supernovae) is a stellar explosion. Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun could emit over its life span. Supernova | |
| Satellite spaceflight, a satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon. Satellite |
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