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English Wikipedia references for Nasa.gov 151-200 of 26570
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| Galileo (spacecraft) Galileo was an unmanned spacecraft sent by NASA to study the planet Jupiter and its moons. Named after the astronomer and Renaissance pioneer Galileo Galilei, it was launched on October 18, 1989 by the Space Shuttle Atlantis on the STS-34 mission. It arrived at Jupiter on December 7, 1995, a little more than six years later, via gravitational assist flybys of Venus and Earth.Despi Galileo_(spacecraft) | |
| Hydrogen Hydrogen () is the chemical element with atomic number 1. It is represented by the symbol H. At standard temperature and pressure, hydrogen is a colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas with the molecular formula H2. With an atomic weight of , hydrogen is the lightest element.Hydrogen is the most abundant chemical element, constituting roughly 75% of the universe's elemental mass. Hydrogen | |
| Helium Helium () is the chemical element with atomic number 2, and is represented by the symbol He. It is a colorless, odorless, tasteless, non-toxic, inert monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among the elements and it exists only as a gas except in extreme conditions.An unknown yellow spectral line signature in sunlight was first observed from a solar eclipse in 1868 by French astronomer Pierre Janssen. Helium | |
| Hawaii Hawaii | |
| Heard Island and McDonald Islands Heard Island and McDonald Islands (abbreviated as HIMI) (formally named the Territory of Heard Island and McDonald Islands) are a volcanic group of barren islands located in the Southern Ocean, about two-thirds of the way from Madagascar to Antarctica, approximately 4099 km south west of Perth. Heard_Island_and_McDonald_Islands | |
| Hafnium Hafnium () is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent, transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869. Hafnium was the second-to-last element of those with stable isotopes to be discovered. It was found by Dirk Coster and Georg von Hevesy in 1923 in Copenhagen, Denmark, and named it Hafnia after the Latin name for "Copenhagen". Hafnium | |
| History of physics Talk:History_of_physics | |
| Houston Houston () is the fourth-largest city in the United States and the largest city within the state of Texas. As of the 2007 U.S. Census estimate, the city has a population of 2.2seat of Harris and the economic center of the metropolitan area—the metropolitan in the U.S. Houston | |
| Hebrew calendar Hebrew calendar ( ha'luach ha'ivri) or Jewish calendar is a lunisolar calendar used by Jews and the followers of Judaism, now predominantly for religious purposes. It is used to reckon the Jewish New Year and dates for Jewish holidays, and also to determine appropriate public reading of Torah portions, Yahrzeits (dates to commemorate the death of a relative), and daily Psalm reading, among many ceremonial uses. Hebrew_calendar | |
| Harrison Schmitt Harrison Hagan "Jack" Schmitt (born July 3, 1935) is an American geologist, a former NASA astronaut, University Professor and a U.S. Senator for one term.He is the last of the Apollo astronauts to arrive and set foot on the Moon (crewmate Eugene Cernan exited the Apollo Lunar Module first). Harrison_Schmitt | |
| Hezekiah Hezekiah (or Ezekias) (Hebrew:Tetragrammaton Mighty God, or The Might of God"; compare Ezekiel) was the 13th king of the Kingdom of Judah.His reign has been dated from 715 Kingdom of Israel by Sargon's Assyrians in c. 720 BC and ruled the southern Kingdom of Judah during the invasion and siege of Jerusalem by Sennacherib in 701 BC. Hezekiah | |
| History of astronomy Astronomy is the oldest of the natural sciences, dating back to antiquity, with its origins in the religious, mythological, and astrological practices of pre-history:astrology, a discipline long interwoven with public and governmental astronomy, and not completely disentangled from it until a few centuries ago in the Western World (see astrology and astronomy). History_of_astronomy | |
| History of Russia History_of_Russia | |
| Hydroponics Hydroponics (from the Greek words hydro water and ponos labor) is a method of growing plants using mineral nutrient solutions, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel, or mineral wool.Plant physiology researchers discovered in the 19th century that plants absorb essential mineral nutrients as inorganic ions in water. Hydroponics | |
| Hematite Hematite, also spelled as hæmatite, is the mineral form of Iron(III) oxide (Fe2O3), one of several iron oxides. Hematite crystallizes in the rhombohedral system, and it has the same crystal structure as ilmenite and as corundum. Hematite and ilmenite form a complete solid solution at temperatures above 950°C. Hematite | |
| Helium-3 This article is about the elemental isotope. For the record label Helium 3, see Muse or A&E Records.Helium-3 (He-3) is a light, non-radioactive isotope of helium with two protons and one neutron, rare on Earth, sought for use in nuclear fusion research. The abundance of helium-3 is thought to be greater on the Moon (embedded in the upper layer of regolith by the solar wind over billions of years) and the solar system's gas giants (left over from the original solar nebula), though still low in quantity (28 ppm of lunar regolith is helium-4 and 0.01 ppm is helium-3). Helium-3 | |
| HAL 9000 HAL 9000 is a fictional computer in Arthur C. Clarke's Space Odyssey saga. The novels, along with two films, begin with 2001: A Space Odyssey, released in 1968. It was ranked #13 on a list of greatest film villains of all time on the AFI's 100 Years... 100 Heroes and Villains. HAL_9000 | |
| Iron Iron () is a chemical element with the symbol Fe () and atomic number 26. Iron is a group 8 and period 4 element. Iron and iron alloys (steels) are by far the most common metals and the most common ferromagnetic materials in everyday use. Fresh iron surfaces are lustrous and silvery-grey in color, but oxidise in air to form a red or brown coating of ferrous oxide or rust. Compared with steel which has a hardness of about 140 Brinell, pure iron is soft, about 80 Brinell. Iron | |
| Internal combustion engine The internal combustion engine is an engine in which the combustion of a fuel occurs with an oxidiser (usually air) in a combustion chamber. In an internal combustion engine the expansion of the high temperature and pressure gases, that are produced by the combustion, directly apply force to a movable component of the engine, such as the pistons or turbine blades and by moving it over a distance, generate useful mechanical energy. Internal_combustion_engine | |
| Interstellar travel Interstellar space travel is unmanned or manned travel between stars. The concept of interstellar travel in starships is a staple in science fiction. Interstellar travel is tremendously more difficult than interplanetary travel. Intergalactic travel, the travel between different galaxies, is even more difficult.Many scientific papers have been published about related concepts. Interstellar_travel | |
| Interstellar travel Talk:Interstellar_travel | |
| Infrared Infrared (IR) radiation is electromagnetic radiation whose wavelength is longer than that of visible light (400-700terahertz radiation (100 µm - 1 mm) and microwaves (~30,000orders of magnitude (750 Infrared | |
| International Space Station International_Space_Station | |
| Interplanetary spaceflight Interplanetary spaceflight or interplanetary travel is travel between planets within a single planetary system. In practice, spaceflights of this type are confined to travel between the planets of the Solar System. Interplanetary_spaceflight | |
| Infrared Talk:Infrared | |
| Ice age Talk:Ice_age | |
| Jet engine A jet engine is a reaction engine that discharges a fast moving jet of fluid to generate thrust in accordance with Newton's laws of motion. This broad definition of jet engines includes turbojets, turbofans, rockets, ramjets, pulse jets and pump-jets. In general, most jet engines are internal combustion engines but non-combusting forms also exist.In some common parlance, the term 'jet engine' is loosely referred to an Jet_engine | |
| Kennedy Space Center The John F. Kennedy Space Center (KSC) is the NASA space vehicle launch facility and Launch Control Center (spaceport) on Merritt Island, Brevard County, Florida, United States. The site is near Cape Canaveral, midway between Miami and Jacksonville, Florida. Kennedy_Space_Center | |
| Jet Propulsion Laboratory Jet_Propulsion_Laboratory | |
| Kuiper belt The Kuiper belt (, rhyming with "viper"), sometimes called the Edgeworth-Kuiper belt, is a region of the Solar System beyond the planets extending from the orbit of Neptune (at 30 AU) to approximately 55 AU from the Sun. It is similar to the asteroid belt, although it is far larger—20 times as wide and 20–200 times as massive. Kuiper_belt | |
| Kurt Vonnegut Kurt Vonnegut, Jr. (November 11, 1922 – April 11, 2007; ) was an American novelist known for works blending satire, black comedy and science fiction, such as Slaughterhouse-Five (1969), Cat's Cradle (1963), and Breakfast of Champions (1973). He was known for his humanist beliefs as well as being honorary president of the American Humanist Association. Kurt_Vonnegut | |
| Konstantin Eduardovich Tsiolkovskii Konstantin Eduardovich Tsiolkovsky (; ) (–September 19, 1935) was an Imperial Russian and Soviet rocket scientist and pioneer of the astronautic theory. He is considered by many to be the father of theoretical astronautics. His works later inspired leading Soviet rocket engineers such as Sergey Korolyov and Valentin Glushko and contributed to the early success of the Soviet space program. Konstantin_Eduardovich_Tsiolkovskii | |
| Kurt Waldheim Kurt Josef Waldheim (21 December 1918 – 14 June 2007) was an Austrian diplomat and politician. Waldheim was Secretary-General of the United Nations from 1972 to 1981, and President of Austria from 1986 to 1992. While running for President in Austria in 1985, his service as an intelligence officer in the Wehrmacht during World War II raised international controversy. Kurt_Waldheim | |
| KC-135 Stratotanker KC-135_Stratotanker | |
| Kuwaiti oil fires Kuwaiti oil fires were a result of the scorched earth policy of Iraqi military forces retreating from Kuwait in 1991 after conquering the country but being driven out by Coalition military forces (see Gulf War).The resulting fires burned out of control because of the dangers of sending in firefighting crews. Kuwaiti_oil_fires | |
| Kepler's laws of planetary motion In astronomy, Kepler's three laws of planetary motion are "The orbit of every planet is an ellipse with the sun at a focus." "A line joining a planet and the sun sweeps out equal areas during equal intervals of Kepler's_laws_of_planetary_motion | |
| Latitude Latitude, usually denoted by the Greek letter phi (φ) gives the location of a place on Earth (or other planetary body) north or south of the equator. Lines of Latitude are the horizontal lines shown running east-to-west on maps (particularly so in the Mercator projection). Latitude | |
| Libya Libya | |
| Geography of Libya With an area of 1,760,000 square kilometers and a Mediterranean coastline of nearly 1,800 kilometers, Libya is fourth in size among the countries of Africa and seventeenth among the countries of the world. Its coastline lies between Egypt and Tunisia. Although the oil discoveries of the 1960s have brought it immense petroleum wealth, at the time of its independence it was an extremely poor desert state whose only important physical asset appeared to be its strategic location at the midpoint of Africa's northern rim. Geography_of_Libya | |
| Light Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm), or perhaps 380–750physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. Light | |
| Lift (force) fluid flowing past the surface of a body exerts a force on it. If the fluid is air, the force is called an aerodynamic force. Lift is defined to be the component of this force which is perpendicular to the oncoming flow direction. It contrasts with the drag force, which is is defined to be the component of the aerodynamic force parallel to the flow direction. An airfoil is a streamlined shape that is capable of generating significantly more lift than drag. Lift_(force) | |
| Large-scale structure of the cosmos In physical cosmology, the large-scale structure of the universe refers to the characterization of observable distributions of matter and light on the largest scales (typically on the order of billions of light-years). Sky surveys and mappings of the various wavelength bands of electromagnetic radiation (in particular 21-cm emission) have yielded much information on the content and character of the universe's structure. Large-scale_structure_of_the_cosmos | |
| Lunar rover Lunar Roving Vehicle (LRV) or lunar rover was a type of surface exploration rover used on the Moon during the Apollo program. It is also known by its popular nickname of moon buggy. Three of the Apollo missions took LRVs to the Moon. Lunar_rover | |
| Lagrangian point The Lagrangian points (; also Lagrange point, L-point, or libration point), are the five positions in an orbital configuration where a small object affected only by gravity can theoretically be stationary relative to two larger objects (such as a Lagrangian_point | |
| Lunar eclipse total penumbral lunar eclipse dims the moon in direct proportion to the area of the sun's disk blocked by the earth. This comparison shows the southern shadow penumbral lunar eclip Lunar_eclipse | |
| Lagrangian point Talk:Lagrangian_point | |
| Lake Eyre Lake Eyre (pronounced "air") is the lowest point in Australia, at approximately (AHD) below sea level, and, on the rare occasions that it fills, it is the largest lake in Australia. It is the focal point of the vast Lake Eyre Basin and is found some 700Adelaide. Lake_Eyre | |
| John Strutt, 3rd Baron Rayleigh John William Strutt, 3rd Baron Rayleigh OM (12 November 1842 English physicist who, with William Ramsay, discovered the element argon, an achievement for which he earned the Nobel Prize for Physics in 1904. He also discovered the phenomenon now called Rayleigh scattering, explaining why the sky is blue, and predicted the existence of the surface waves now known as Rayleigh waves. John_Strutt,_3rd_Baron_Rayleigh | |
| Leonids For a list of famous people named Leonid, please see Leonid (a disambiguation page).The Leonids (lee-uh-nids) are a prolific meteor shower associated with the comet Tempel-Tuttle. The Leonids get their name from the location of their radiant in the constellation Leo:sky. Leonids | |
| Leonids Talk:Leonids |
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