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English Wikipedia references for Nasa.gov 301-350 of 26570
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| Solar energy Solar energy is the radiant light and heat from the Sun that has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation along with secondary solar resources such as wind and wave power, hydroelectricity and biomass account for most of the available renewable energy on Earth. Only a minuscule fraction of the available solar energy is used. Solar_energy | |
| Systems engineering Systems engineering is an interdisciplinary field of engineering that focuses on how complex engineering projects should be designed and managed. Issues such as logistics, the coordination of different teams, and automatic control of machinery become more difficult when dealing with large, complex projects. Systems engineering deals with work-processes and tools to handle such projects, and it overlaps with both technical and human-centered disciplines such as control engineering and project management. Systems_engineering | |
| Solar System Talk:Solar_System | |
| Sirius Sirius | |
| SETI Search for Extra-Terrestrial Intelligence (SETI) is the collective name for a number of activities to detect intelligent extraterrestrial life. The general approach of SETI projects is to survey the sky to detect the existence of transmissions from a civilization on a distant planetscientific community as hard science. The United States Government contributed to SETI early on, but recent work has been primarily funded by private sources. SETI | |
| List of nearest stars list of stars nearest to the Earth is ordered by increasing distance out to a maximum of 5 parsecs (16.308 light-years). Including the Solar System, there are currently 50 stellar systems known which may lie within this distance. These systems contain a total of 65 known stars and 4 known brown dwarfs.Stars and brown dwarfs which have an apparent magnitude greater than 6.5, and which consequently cannot typically be observed with the naked eye, are shown in light blue. List_of_nearest_stars | |
| Strait of Gibraltar The Strait of Gibraltar (Arabic:Spanish:Estrecho de Gibraltar) is a strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Spain from Morocco. The name comes from Gibraltar, which in turn originates from the Arabic Jebel Tariq (meaning "Tariq's mountain"), albeit the Arab name for the Strait is Bab el-Zakat or "Gate of Charity". It is also known as the Straits of Gibraltar or STROG (Strait Of Gibraltar), in naval use and as "Pillars of Hercules "(Greek: Strait_of_Gibraltar | |
| Space Shuttle NASA's Space Shuttle, officially called the Space Transportation System (STS), is the spacecraft currently used by the United States government for its human spaceflight missions and is scheduled to be retired from service in 2010. At launch, it consists of a rust-colored external tank (ET), two white, slender Solid Rocket Boosters (SRBs), and the orbiter, a winged spaceplane which is the space shuttle in the narrowest sense. Space_Shuttle | |
| Star catalogue star catalogue, or star catalog, is an astronomical catalogue that lists stars. In astronomy, many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the years, and this article covers only some of the more frequently quoted ones. Most of the recent catalogues are available in electronic format and can be freely downloaded from NASA's Astronomical Data Center and other places (see links at end). Star_catalogue | |
| Space Shuttle Challenger Space Shuttle Challenger (NASA Orbiter Vehicle Designation:Space Shuttle orbiter to be put into service, Columbia being the first. Its maiden flight was on April 4, 1983, and it completed nine missions before breaking apart 73 seconds after the launch of its tenth mission, STS-51-L on January 28, 1986, resulting in the death of all seven crew members. Space_Shuttle_Challenger | |
| Space Shuttle Enterprise The Space Shuttle Enterprise (NASA Orbiter Vehicle Designation:Space Shuttle orbiter. It was built for NASA as part of the Space Shuttle program to perform test flights in the atmosphere. It was constructed without engines or a functional heat shield, and was therefore not capable of spaceflight.Originally, Enterprise had been intended to be refitted for orbital flight, which would have made it the second space shuttle to fly after Columbia. Space_Shuttle_Enterprise | |
| Space Shuttle Columbia Space_Shuttle_Columbia | |
| Space Shuttle Discovery Space_Shuttle_Discovery | |
| Space Shuttle Atlantis Space_Shuttle_Atlantis | |
| Space Shuttle Endeavour Space_Shuttle_Endeavour | |
| Space exploration Space exploration is the use of astronomy and space technology to explore outer space. Physical exploration of space is conducted both by human spaceflights and by robotic spacecraft. astronomy—pre-dates reliable recorded history, it was the development of large liquid-fueled rocket engines during the early 20th century that allowed physical space exploration to become a reality. Common rationales for exploring space include advancing scientific research, uniting different nat Space_exploration | |
| Space science Space science is an all-encompassing term that describes all of the various science fields that are concerned with the study of the Universe, generally also meaning "excluding the Earth" and "outside of the Earth's atmosphere". Originally, all of these fields were considered part of astronomy. Space_science | |
| Sputnik 1 Sputnik 1 ( , "Satellite-1", ПС-1 (PS-1, i.e. "Простейший Спутник-1", or Elementary Satellite-1)) was the world's first Earth-orbiting artificial satellite. It was launched into a low altitude elliptical orbit by the Soviet Union on 4 October 1957, and was the first in a series of satellites collectively known as the Sputnik program. The unanticipated announcement of Sputnik 1'Sputnik crisis in the United States and ignited the Space Race within the Cold War. Sputnik_1 | |
| Sputnik program Sputnik program (, ) was a series of robotic spacecraft missions launched by the Soviet Union. The first of these, Sputnik 1, launched the first human-made object to orbit the Earth. That launch took place on October 4, 1957 as part of the International Geophysical Year and demonstrated the viability of using artificial satellites to explore the upper atmosphere. Sputnik_program | |
| Scuba set A scuba set is an independent breathing set that provides a scuba diver with the breathing gas necessary to breathe underwater during scuba diving. It is much used for sport diving and some sorts of work diving.The word SCUBA was originally an acronym for Self-Contained Underwater Breathing Apparatus. Scuba_set | |
| Spacecraft propulsion Spacecraft propulsion is any method used to accelerate spacecraft and artificial satellites. There are many different methods. Each method has drawbacks and advantages, and spacecraft propulsion is an active area of research. However, most spacecraft today are propelled by exhausting a gas from the back/rear of the vehicle at very high speed through a supersonic de Laval nozzle. This sort of engine is called a rocket engine. Spacecraft_propulsion | |
| Solar wind solar wind is a stream of charged particles—plasma—upper atmosphere of the sun. It consists mostly of electrons and protons with energies of about 1 keV. The stream of particles varies in temperature and speed with the passage of time. These particles are able to escape the sun's gravity, in part because of the high temperature of the corona, but also because of high kinetic energy that particles gain through a process that is not well-understood. Solar_wind | |
| Speed of light The speed of light normally refers the speed of light in a vacuum, and is an important physical constant in modern physics. Light travels at different speeds through different materials, but in vacuum light travels fastest, and the speed does not vary with the color, intensity, or direction of travel. Speed_of_light | |
| Sea of Marmara Sea of Marmara (Turkish:Marmara Denizi), also known as the Sea of Marmora or the Marmara Sea, and in the context of classical antiquity as Propontis (Greeksea that connects the Black Sea to the Aegean Sea, thus separating Turkey's Asian and European parts. The Bosporus strait connects it to the Black Sea and the Dardanelles strait to the Aegean. Sea_of_Marmara | |
| Surtsey Surtsey (Icelandic:Surtur's island") is a volcanic island off the southern coast of Iceland. At it is also the southernmost point of Iceland. It was formed in a volcanic eruption which began 130sea level, and reached the surface on 14 November 1963. The eruption lasted until 5 June 1967, when the island reached its maximum size of . Since then, wind and wave erosion have caused the island to steadily diminish in size Surtsey | |
| Supernova Talk:Supernova | |
| Season A season is a division of the year, marked by changes in weather.Seasons result from the yearly revolution of the Earth around the Sun and the tilt of the Earth's axis relative to the plane of revolution. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to go into hibernation or to migrate, and plants to be dormant. Season | |
| SN 1987A SN_1987A | |
| Scopolamine Talk:Scopolamine | |
| Space observatory A space observatory is any instrument in outer space which is used for observation of distant planets, galaxies, and other outer space objects. This category is distinct from other observatories located in space that are pointed toward the earth for the purpose of reconnaissance and other types of information gathering. Space_observatory | |
| Space elevator A space elevator is a proposed structure designed to transport material from a celestial body's surface into space. Many variants have been proposed, all of which involve traveling along a fixed structure instead of using rocket powered space launch. The concept most often refers to a structure that reaches from the surface of the Earth on or near the Equator to Space_elevator | |
| Square root mathematics, a square root of a number x is a number n such that n2 = x, or, in other words, a number n whose square (the result of multiplying the number by itself) is x. Every non-negative real number x has a unique non-negative square root, called the principal square root, which is denoted with a radical symbol as , or, using exponent notation, as x1/2. Square_root | |
| Lists of stars Lists_of_stars | |
| Space colonization Space colonization (also called space settlement, space humanization, space habitation, etc.) is the concept of autonomous (self-sufficient) human habitation of locations outside Earth. theme in science fiction, as well as a long-term goal of various national space programs.While many people think of space colonies on the Moon or Mars, others argue that the first colonies will be in orbit. Space_colonization | |
| Safety engineering Safety engineering is an applied science strongly related to systems engineering and the subset System Safety Engineering. Safety engineering assures that a life-critical system behaves as needed even when pieces fail. Safety_engineering | |
| Sojourner Truth Sojourner Truth (1797 – November 26, 1883) was the self-given name, from 1843, of Isabella Baumfree, an African-American abolitionist and women's rights activist. Truth was born into slavery in Swartekill, New York. Her best-known speech, Ain't I a Woman?, was delivered in 1851 at the Ohio Women's Rights Convention in Akron, Ohio. Sojourner_Truth | |
| Solar cell solar cell or photovoltaic cell is a device that converts light directly into electricity by the photovoltaic effect. Sometimes the term solar cell is reserved for devices intended specifically to capture energy from sunlight, while the term photovoltaic cell is used when the light source is unspecified. Solar_cell | |
| Single-stage-to-orbit single-stage-to-orbit (or SSTO) vehicle reaches orbit from the surface of a body without jettisoning hardware, expending only propellants and fluids. The term usually, but not exclusively, refers to reusable vehicles.No Earth-launched SSTO launch vehicles have ever been constructed. Single-stage-to-orbit | |
| Single-stage-to-orbit Talk:Single-stage-to-orbit | |
| Solar sail Solar sails (also called light sails or photon sails) are a form of spacecraft propulsion using the pressure of light from a star or laser to push enormous ultra-thin mirrors to high speeds. Solar_sail | |
| Skylab Skylab was the United States' first space station, and the second space station visited by a human crew. It was also the only space station NASA launched alone. The 100-ton space station was in Earth's orbit from 1973 to 1979, and it was visited by crews three times in 1973 and 1974. Skylab | |
| Strontium Talk:Strontium | |
| Saturn V Talk:Saturn_V | |
| S-3 Viking S-3_Viking | |
| Supermarine Spitfire Supermarine_Spitfire | |
| Terraforming Terraforming (literally, "Earth-shaping") of a planet, moon, or other body is the hypothetical process of deliberately modifying its atmosphere, temperature, surface topography or ecology to be similar to those of Earth to make it habitable by humans. Terraforming | |
| Americas Americas, or America, are the lands of the Western hemisphere or New World, comprising the continents of North America and South America with their associated islands and regions. America may be ambiguous in English, as it is more commonly used to refer to the United States of America. The Americas cover 8.3% of the Earth's total surface area (28.4% of its land area) and contain about 13.5% of the human population (about 900 million people). Americas | |
| Tasmania Tasmania is an Australian island and state of the same name. It is located south of the eastern side of the continent, being separated from it by Bass Strait. The state of Tasmania includes the island of Tasmania, which is the 26th largest island in the world, and other surrounding islands. The state has an estimated population of 500,000 () with almost half located in the greater Hobart area, and an area of , of which the main island covers . Tasmania | |
| Tensor For component-based "classical" treatment of tensors, see Classical treatment of tensors. See Component-free treatment of tensors for a modern abstract treatment, and Intermediate treatment of tensors for an approach which bridges the two.A tensor is an object which includes and extends the notion of scalar, vector, and matrix. Tensor | |
| Turks and Caicos Islands The Turks and Caicos Islands (TCI, ) are a British Overseas Territory consisting of two groups of sub-tropical islands in the West Indies, the larger Caicos Islands and the smaller Turks Islands, known for tourism and as an offshore financial centre.The Turks and Caicos Islands are situated about southeast of Miami in the United States, and southeast of Mayaguana in the Bahamas, and have a total land area of . The islands are geographically contiguous to the Bahamas, but are politically a separate entity. Turks_and_Caicos_Islands |
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