| Apollo 11 |crew_size = 3 Apollo_11
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| Apollo 8 Florida, USA Apollo_8
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| Astronaut An astronaut or cosmonaut ( ) is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. Astronaut
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| Asteroid Asteroids, sometimes called minor planets or planetoids, are bodies—primarily of the inner Solar System—that are smaller than planets but larger than meteoroids (commonly defined as being 10 meters across or less), with the exception of comets. The distinction between asteroids and comets is made on visual appearance when discovered: Comets show a perceptible coma (a fuzzy "atmosphere"), while asteroids do not. Asteroid
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| Aircraft An aircraft is a vehicle which is able to fly through the Earth's atmosphere or through any other atmosphere. Rocket vehicles are not aircraft if they are not supported by the surrounding air. Aircraft
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| Atom |- Atom
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| Alps The Alps (; ; ; ; ) is the name for one of the great mountain range systems of Europe, stretching from Austria and Slovenia in the east, through Italy, Switzerland, Liechtenstein and Germany to France in the west. The word "Alps" was taken via French from Latin Alpes (meaning "the Alps"), which may be influenced by the Latin words albus (white) or altus (high) or more likely a Latin rendering of a Celtic or Ligurian original. Alps
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| Astrometry Astrometry is the branch of astronomy that relates to precise measurements and explanations of the positions and movements of stars and other celestial bodies. Although once thought of as an esoteric field with little useful application for the future, the information obtained by astrometric measurements is now very important in contemporary research into the kinematics and physical origin of our Solar System and our Galaxy, the Milky Way. Astrometry
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| Astronomical unit The astronomical unit (AU or au or a.u. Astronomical_unit
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| Geography of Antarctica |- Geography_of_Antarctica
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| Antimatter In particle physics and quantum chemistry, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles. For example, an antielectron (a positron, an electron with a positive charge) and an antiproton (a proton with a negative charge) could form an antihydrogen atom in the same way that an electron and a proton form a normal matter hydrogen atom. Antimatter
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| Ammonia | Section2 = Ammonia
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| Anno Domini May also be spelled "." (Medieval Latin: In the year of (the/Our) Lord), Blackburn & Holford-Strevens p. Anno_Domini
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| Apollo program The Apollo program was a human spaceflight program undertaken by NASA during the years 1961–1975 with the goal of conducting manned moon landing missions. President John F. Apollo_program
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| Apollo program Talk:Apollo_program
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| Ibn al-Haytham Ibn_al-Haytham
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| Asteroid Talk:Asteroid
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| Apollo 13 |crew_size = 3 Apollo_13
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| Apollo 7 Florida, USA Apollo_7
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| Apollo 9 Florida, USA Apollo_9
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| Archimedes Archimedes of Syracuse (Greek: He used the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, and gave a remarkably accurate approximation of Pi. He also defined the spiral bearing his name, formulas for the volumes of surfaces of revolution and an ingenious system for expressing very large numbers. Archimedes
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| Antlia Antlia (, , from Ancient Greek: ἀντλία - antlia, "bilge-water, filth") is a relatively new constellation as it was only created in the 18th century, being too faint to be acknowledged by the ancient Greeks. The IAU adopted it as one of the 88 modern constellations. Antlia
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| Absolute magnitude In astronomy, absolute magnitude (also known as absolute visual magnitude) is the apparent magnitude an object would have if it were at a standard luminosity distance (10 parsecs, 1 AU, or 100 km depending on object type) away from the observer, in the absence of astronomical extinction. It allows the overall brightnesses of objects to be compared without regard to distance. Absolute_magnitude
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| Apollo 1 Florida, USA Apollo_1
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| Apollo 10 |crew_size = 3 Apollo_10
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| Apollo 12 mass 28,838 kg Apollo_12
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| Apollo 14 |crew_members = 3 Apollo_14
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| Apollo 15 |crew_size = 3 Apollo_15
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| Apollo 16 |crew_size = 3 Apollo_16
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| Apollo 17 |sign = Command module:AmericaLunar module:Challenger Apollo_17
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| Alpha Centauri /B Alpha_Centauri
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| Area 51 | website = Area_51
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| Adrastea (moon) |discovered = July 8, 1979 Adrastea_(moon)
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| Astrobiology Astrobiology (from Greek , astron, "constellation, star"; , bios, "life"; and , -logia) is the interdisciplinary study of life in the Universe, combining aspects of astronomy, biology and geology.NASA - Astrobiology It is focused primarily on the study of the origin, distribution and evolution of life. Astrobiology
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| Aerodynamics Aerodynamics is a branch of dynamics concerned with studying the motion of air, particularly when it interacts with a moving object. Aerodynamics is closely related to fluid dynamics and gas dynamics, with much theory shared between them. Aerodynamics
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| Archaeoastronomy Archaeoastronomy (also spelled archeoastronomy) is the study of how peoples in the past "have understood the phenomena in the sky, how they used phenomena in the sky and what role the sky played in their cultures."Sinclair 2006:13 Clive Ruggles argues it specifically is not the study of ancient astronomy, as astronomy is a culturally specific concept and ancient peoples may have related to the sky in a different way. Archaeoastronomy
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| Archaeopteryx Late Jurassic Archaeopteryx
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| Altair Altair (α Aql / α Aquilae / Alpha Aquilae / Atair) is the brightest star in the constellation Aquila and the twelfth brightest star in the nighttime sky, at visual magnitude 0.77. Altair
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| AIM-54 Phoenix The AIM-54 Phoenix is a radar-guided, long-range air-to-air missile, carried in clusters of up to six missiles — formerly on the U.S. AIM-54_Phoenix
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| Attribution of recent climate change Attribution of recent climate change is the effort to scientifically ascertain mechanisms responsible for relatively recent changes observed in the Earth's climate. The effort has focused on changes observed during the period of instrumental temperature record, when records are most reliable; particularly on the last 50 years, when human activity has grown fastest and observations of the upper atmosphere have become available. Attribution_of_recent_climate_change
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| Acid rain Acid rain is rain or any other form of precipitation that is unusually acidic. It has harmful effects on plants, aquatic animals, and infastructure. Acid_rain
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| Beryllium Beryllium () is a chemical element with the symbol Be and atomic number 4. A bivalent element, beryllium is a steel grey, strong, light-weight yet brittle alkaline earth metal. Beryllium
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| Black Sea The Black Sea is an inland sea bounded by southeastern Europe, the Caucasus and the Anatolian peninsula (Turkey) and is ultimately connected to the Atlantic Ocean via the Mediterranean and Aegean Seas and various straits. The Bosporus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects it to the Aegean Sea region of the Mediterranean. Black_Sea
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| Boron Boron () is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent nonmetallic element which occurs abundantly in the evaporite ores borax and ulexite. Boron
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| Big Bang The Big Bang is the cosmological model of the universe that is best supported by all lines of scientific evidence and observation. As used by scientists, the term Big Bang generally refers to the idea that the universe has expanded from a primordial hot and dense initial condition at some finite time in the past, and continues to expand to this day. Big_Bang
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| B-2 Spirit The Northrop Grumman B-2 Spirit is a multi-role stealth heavy bomber, capable of penetrating dense anti-aircraft defenses to deploy both conventional and nuclear weapons. B2s are operated exclusively by the United States Air Force. B-2_Spirit
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| B-52 Stratofortress Talk:B-52_Stratofortress
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| Boeing 747 |name = Boeing 747 Boeing_747
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| Black hole A black hole is a theoretical region of space in which the gravitational field is so powerful that nothing, not even electromagnetic radiation (e.g. Black_hole
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| Babylon 5 | language = English Babylon_5
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